Understanding Sin: A Foundational Truth for Evangelism

The Absolute Reality of Sin

Before we can effectively explain sin to someone who denies absolute morality, we must first ensure that we fully understand what sin is according to Scripture. Sin is not merely a religious term. It is the foundational problem of humanity, a real moral and spiritual violation that has corrupted every part of human life and society. Sin is a violation of God’s holy law—His objective, unchanging standard of righteousness. It is rebellion, lawlessness, and the failure to reflect God’s holiness (1 John 3:4; Romans 3:23). And unlike the claims of relativism, sin is not defined by culture, but by the Creator.

The Origin of Sin

Sin began with Satan, the original opposer of God (John 8:44), and entered the human race through Adam, the first man, who disobeyed God’s explicit command in the Garden of Eden (Genesis 2:17; 3:6; Romans 5:12). Adam’s sin brought death, alienation from God, and corruption into human nature. From that moment, all his descendants were born under sin’s power and consequences (Psalm 51:5; Romans 5:18–19).

The Effects of Sin

Sin has devastated mankind:

• It brought spiritual death, severing our relationship with God (Isaiah 59:2).

• It introduced physical death, along with sickness, pain, suffering, and aging (Genesis 3:16–19; Romans 8:20–22).

• It resulted in corruption of the mind and will (Ephesians 4:17–19).

• It placed all of humanity under divine judgment and wrath (Romans 1:18; John 3:36).

Man’s heart is not neutral—it is “more deceitful than all else and is desperately sick” (Jeremiah 17:9). This condition is universal; “there is no man that does not sin” (2 Chronicles 6:36).

The Nature of Sin: A Closer Look

Scripture uses several key terms to describe the varieties and degrees of sin. These distinctions help us grasp the depth and seriousness of mankind’s rebellion.

1. Sin (Hamartía):
The basic term for sin means “missing the mark.” This could refer to failing to live up to God’s holy standard—not only by doing evil but by failing to do good (James 4:17).

2. Transgression:
This means a willful violation, an act of disobedience. The Hebrew pesha and Greek parabasis refer to “stepping over” a clear boundary. It is not accidental—it is deliberate rebellion (Romans 4:15; Galatians 3:19).

3. Trespass (Greek: paraptōma):
Literally meaning “a fall beside” or a false step, this term includes errors, lapses, and careless deviations from God’s will (Romans 5:15; Ephesians 2:1).

4. Error and Mistake:
Not all sin is deliberate. Some sin results from ignorance, foolishness, or carelessness (Leviticus 4:2; Numbers 15:27–29). But even when unintended, it is still sin and must be atoned for.

5. Iniquity (Hebrew: avon):
This term refers to perversion or twistedness—a deep moral corruption of the inner man (Psalm 38:18; Isaiah 59:12). It highlights the defiling nature of sin on the soul.

The Power and Practice of Sin

Sin is not just an act—it is a power that enslaves. Romans 6:6 calls it a “body of sin”, and Romans 7:14–24 describes sin as a force dwelling in the flesh, warring against the mind. Jesus said, “Everyone who commits sin is the slave of sin” (John 8:34).

There is a critical biblical distinction between occasional sin and the practice of sin. In 1 John 3:4–8, John uses present active participles to describe ongoing, habitual sin, marking the life of an unregenerate person. By contrast, in 1 John 2:1 he writes,

“If anyone sins, we have an Advocate with the Father, Jesus Christ the righteous.”

The believer may fall into sin, but he does not live in sin as a pattern of life. He does not continue in rebellion. True salvation leads to transformation (1 John 3:9–10; Titus 2:11–14).

“Sinners” in the Biblical Sense

While all are sinners by nature (Romans 3:23), the term “sinners” often refers more narrowly to those who practice sin or have a reputation for sin (Luke 7:37–39; Galatians 2:15). These are not merely people who fail—they are people who live in ongoing defiance of God’s commands and make no effort to turn from it.

Sharing in the Sins of Others

Scripture teaches that one can become guilty of another’s sin by approving it, enabling it, or remaining silent in the face of it (Psalm 50:18; 1 Timothy 5:22). Association with unrepentant sinners brings consequences (2 John 9–11; Revelation 18:4–8). This highlights the communal seriousness of sin and the need for vigilance and holiness (1 Corinthians 15:33–34).

Avoidance and Victory Over Sin

Victory over sin is only possible through the knowledge of God’s Word, the transforming power of the gospel, and the guidance of the Holy Spirit through the Scriptures (Psalm 119:11; Romans 6:12–22; Galatians 5:16–26). The love of God and neighbor, which summarizes the law (Matthew 22:37–40), empowers the believer to resist sin and pursue righteousness.

Christians are called to “live as to the Spirit from the standpoint of God” (1 Peter 4:1–6) and to walk in wisdom (Proverbs 19:2; Ecclesiastes 9:18). We are not hemmed in by endless rules, but we are called to exercise godly wisdom, discernment, and holiness (Romans 8:21).

Final Realities: Judgment or Redemption

Sin has consequences—temporal and eternal. God will not be mocked (Galatians 6:7–8). Sins cannot remain hidden (1 Timothy 5:24). Judgment will come (Hebrews 9:27), but for those who fear God and turn from sin, there is mercy (Ecclesiastes 8:11–13).

Only in Christ can the sinner find forgiveness, freedom, and righteousness. The gospel is not a call to be better—it is a call to be made new (2 Corinthians 5:17). And this transformation begins with a true understanding of what sin is, how it operates, and why we need to be saved from it.

---

Now that this biblical foundation is laid, we can effectively explain sin even to someone who denies the existence of absolute morality. Proceed to the main article below for that evangelistic framework.

Explaining the Concept of Sin to Someone Who Does Not Believe in Absolute Morality

Introduction: Confronting Moral Relativism in Evangelism

When sharing the gospel with someone who does not believe in absolute morality, the challenge is not merely theological—it is foundational. Many today hold to moral relativism, believing that right and wrong are subjective, culturally conditioned, or personally defined. In such a worldview, the biblical concept of sin appears outdated, offensive, or meaningless.

Yet the message of salvation hinges on sin being real. The good news of Jesus Christ only makes sense in light of the bad news—that humanity has rebelled against a holy Creator and stands condemned. Romans 3:23 declares,

“All have sinned and fall short of the glory of God.”

So how does the Christian apologist or evangelist explain sin to someone who denies objective moral categories? This article provides a biblical and rational strategy for doing just that. We will demonstrate that everyone—including the moral relativist—lives as though sin is real, because they cannot escape the moral knowledge God has placed within them (Romans 2:14–15). By showing the internal inconsistency of relativism and appealing to conscience, logic, and Scripture, we can bring the reality of sin into focus.

1. The Starting Point: The Inescapability of Moral Judgment

Although a relativist may claim there is no absolute right or wrong, they will inevitably make moral judgments in everyday life. They may condemn racism, injustice, lying, or abuse. They may protest corruption or demand fairness. They care deeply about how others treat them and what policies govern society.

This moral behavior exposes a contradiction. If morality is truly relative—merely a matter of opinion or social preference—then no one can ever be morally wrong, including murderers, rapists, or tyrants. But no one lives that way.

Romans 2:14–15 explains why:

“For when Gentiles who do not have the Law do instinctively the things of the Law… they show the work of the Law written in their hearts, their conscience bearing witness and their thoughts alternately accusing or else defending them.”

Here Paul explains that God has written His moral law on the human heart. Even those without special revelation (i.e., Scripture) have an innate awareness of right and wrong. The conscience may be suppressed or distorted, but it still functions.

The evangelist can point to this reality and ask the relativist:

• Why do you think some things are wrong, regardless of culture or context?

• Why does your conscience feel guilt or compel you to act righteously?

• Why do you hold others accountable if morality is just preference?

These questions expose the truth: the relativist knows there is real right and wrong.

2. Establishing the Need for a Moral Standard

Once it is clear that moral judgments are inescapable, the next step is to establish that objective morality requires a moral standard—one that is above individuals and cultures.

Without such a standard, all moral claims collapse into subjective preference. If there is no objective moral law, then:

• Slavery in the 1800s was not wrong, just different.

• The Holocaust was not evil, just a cultural decision.

• Lying and exploitation are not wrong, unless someone dislikes them.

This is clearly unacceptable to anyone with a functioning moral conscience.

Therefore, if objective morality exists—and it does—it must be grounded in something beyond human opinion or consensus. The only sufficient explanation is a personal, moral Lawgiver who defines good and evil: God.

Romans 3:19–20 states:

“Now we know that whatever the Law says, it speaks… so that every mouth may be closed and all the world may become accountable to God.”

Sin is not simply breaking a human code—it is violating God’s law, rooted in His holy nature. His moral standard is universal, absolute, and unchanging because He is (Malachi 3:6).

3. Defining Sin According to Scripture

With the ground prepared, we can define sin biblically.

Sin is the violation of God’s law—not merely outward acts, but inward attitudes and desires that contradict His will. 1 John 3:4 says:

“Everyone who practices sin also practices lawlessness, and sin is lawlessness.”

Sin includes both commission (doing what is forbidden) and omission (failing to do what is required). James 4:17 adds,

“To one who knows the right thing to do and does not do it, to him it is sin.”

Romans 1–3 explains that sin is universal and comprehensive:

• All people are under sin (Romans 3:9).

• All have turned aside (Romans 3:12).

• No one does good perfectly—not even one (Romans 3:10–12).

Sin is not a religious construct—it is a spiritual and moral reality, evidenced by humanity’s rebellion, corruption, guilt, and death. It explains why the world is filled with suffering, injustice, and brokenness.

When engaging a relativist, emphasize that sin is not about feeling bad or breaking human rules, but about violating the Creator’s righteous law. It is cosmic treason against the One who made us.

4. Exposing the Consequences of Sin

Sin brings separation from God (Isaiah 59:2), death (Romans 6:23), and ultimately eternal judgment. Hebrews 9:27 declares,

“It is appointed for men to die once and after this comes judgment.”

Even if a person denies objective morality, their conscience still bears witness, and they know they are not righteous. They feel guilt, shame, and fear of death. They sense the weight of judgment, even if they suppress it.

Ecclesiastes 3:11 says that God “has set eternity in their heart.” This includes an awareness of accountability. The evangelist should appeal to that reality—not with manipulation, but with truth.

Ask:

• Why do you feel guilt?

• Why do you hope for justice?

• What if your life was judged by a perfect standard?

Such questions prepare the heart to see sin not just as an abstract idea, but as a personal offense against a holy God.

5. Presenting the Gospel: God’s Solution to Sin

With sin defined and conscience awakened, the evangelist can now present the good news:

“For the wages of sin is death, but the free gift of God is eternal life in Christ Jesus our Lord” (Romans 6:23).

Jesus Christ, the sinless Son of God, bore the penalty for our sin on the cross (Isaiah 53:5–6; 2 Corinthians 5:21). He rose again, victorious over death, and now offers forgiveness, righteousness, and eternal life to those who repent and believe (Romans 10:9–10).

This message only makes sense when the concept of sin is understood. But when it is, the gospel becomes not only logical but urgent and necessary.

6. Practical Guidance for Evangelists

• Be patient: Moral relativism is deeply ingrained in modern culture. Don’t rush; expose its contradictions with grace and clarity.

• Appeal to conscience: God has placed His law in every heart. Use real-life examples to stir moral awareness.

• Use Scripture: God’s Word is living and active (Hebrews 4:12). Even skeptics are convicted when confronted with divine truth.

• Avoid moral superiority: You are not arguing as one who is righteous in yourself. You are a sinner saved by grace, speaking the truth in love.

Titus 3:2–5 reminds us to “speak evil of no one, be peaceable, gentle, showing every consideration for all men… for we also once were foolish ourselves.” Approach each conversation with humility and biblical clarity.

Conclusion: Conscience, Truth, and the Reality of Sin

Though many claim not to believe in absolute morality, no one lives consistently with that claim. Moral relativism collapses under its own weight, and the reality of sin remains inescapable. By appealing to the conscience, exposing the need for an objective moral standard, and proclaiming the truth of Scripture, the evangelist can lead even the relativist to understand sin—and more importantly, to seek the Savior.

The doctrine of sin is not a human invention. It is God’s verdict on fallen humanity, revealed in Scripture, affirmed by conscience, and verified by the condition of the world. And it is the foundation for understanding grace.

You May Also Enjoy

Negative and Positive Arguments in Christian Apologetics: A Biblical Defense of Faith and Refutation of Error

About the Author

CLICK LINKED IMAGE TO VISIT ONLINE STORE

CLICK TO SCROLL THROUGH OUR BOOKS