Last updated: 2026-05-23
Is Cheating (Infidelity) a Sin?
Quick Answer
Yes, cheating (infidelity) is considered grave sin in Christianity.
Author: IsItASin Editorial Team · Last updated: 2026-05-23
Yes, cheating (infidelity) is considered grave sin in Christianity. Exodus 20:14 — 'You shall not commit adultery.' This is a grave sin matter in Christianity with clear guidance for believers.
What Christianity Teaches About Cheating (Infidelity)
Christianity considers Cheating (Infidelity) to be a sin — a grave matter in the biblical tradition.
Wondering what other faiths teach?
Christian Denominations: How They Differ on Cheating (Infidelity)
Catholic Church
Adultery is a grave sin against the Sixth Commandment. The Catechism (2380-2384) states it violates the marriage covenant and is intrinsically disordered. It requires sacramental confession and genuine repentance.
Catechism of the Catholic Church
Protestant Churches
All Protestant denominations condemn adultery as a serious sin violating God's design for marriage. It is grounds for divorce in most traditions. Repentance and restoration are possible through Christ.
Holy Bible (Protestant canon)
Eastern Orthodox
The Orthodox Church considers adultery a serious sin against the sacrament of marriage. It is an impediment to receiving the Eucharist until confession and a period of repentance (epitimia) are completed.
Orthodox Church Tradition
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What Christianity Teaches About Cheating (Infidelity)
Christianity unambiguously condemns infidelity. The Seventh Commandment prohibits adultery, and Jesus raised the bar further in the Sermon on the Mount, teaching that even lustful looking constitutes adultery of the heart. The Catholic Church classifies adultery as a mortal sin requiring sacramental confession. Protestant denominations universally condemn it as a violation of the marriage covenant, though many emphasize the possibility of forgiveness and restoration through repentance. The Orthodox Church treats it as a serious sin requiring a period of repentance before returning to communion.
Biblical References
- Exodus 20:14 — 'You shall not commit adultery.'
- Matthew 5:27-28 — 'Everyone who looks at a woman with lustful intent has already committed adultery with her in his heart.'
- Matthew 19:9 — 'Anyone who divorces his wife, except for sexual immorality, and marries another, commits adultery.'
- Hebrews 13:4 — 'Let marriage be held in honor among all, and let the marriage bed be undefiled.'
- 1 Corinthians 6:9 — 'Neither the sexually immoral, nor idolaters, nor adulterers... will inherit the kingdom of God.'
Key Teachings
| Teaching | Scripture Reference | Practical Application |
|---|---|---|
| You shall not commit adultery. | Exodus 20:14 | Apply this teaching to daily decisions. |
| Everyone who looks at a woman with lustful intent has already committed adultery with her in his heart. | Matthew 5:27-28 | Apply this teaching to daily decisions. |
| Anyone who divorces his wife, except for sexual immorality, and marries another, commits adultery. | Matthew 19:9 | Apply this teaching to daily decisions. |
| Let marriage be held in honor among all, and let the marriage bed be undefiled. | Hebrews 13:4 | Apply this teaching to daily decisions. |
| Neither the sexually immoral, nor idolaters, nor adulterers... will inherit the kingdom of God. | 1 Corinthians 6:9 | Apply this teaching to daily decisions. |
What You Should Do
- If you have cheated, the first step is to stop the affair completely and commit to honesty going forward.
- Christian: Confess to God in prayer. Catholics should seek the Sacrament of Reconciliation. Consider Christian marriage counseling to rebuild trust.
- All traditions: Consider professional marriage counseling. Rebuilding trust takes time, transparency, and consistent effort. Infidelity doesn't have to end a marriage, but healing requires genuine repentance and hard work.
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Can God forgive infidelity?
Yes.
Yes. All three Abrahamic faiths teach that God is infinitely merciful. Christianity points to God's grace through Christ. Forgiveness from God does not eliminate the earthly consequences of rebuilding trust.
Is emotional affair cheating a sin?
Christianity considers lustful thoughts sinful (Matthew 5:28).
Christianity considers lustful thoughts sinful (Matthew 5:28). Most religious scholars consider emotional infidelity a form of betrayal, even if less severe physically.
Is cheating grounds for divorce?
Christianity: Jesus permitted divorce 'except for sexual immorality' (Matthew 19:9).
Christianity: Jesus permitted divorce 'except for sexual immorality' (Matthew 19:9). Catholicism requires annulment process. Most Protestants permit divorce for adultery. All traditions, however, encourage reconciliation when possible.
What if my spouse cheated — am I sinning by staying?
No.
No. Choosing to forgive and work on the marriage is not a sin — it is an act of grace and courage. All three traditions value forgiveness and reconciliation. However, you are not obligated to stay in an abusive or unrepentant situation. Seek counsel from a trusted religious leader.
