Abortion is without question the murder of a child made in God's image. It should not be permitted even in the case of rape or incest as the child is innocent of any perpetrator's crime. The commission of the terrible evil of rape or incest can never justify the terrible evil of murder. In exceptional cases a mother's life may be jeopardized by pregnancy and only in this exceptional case does the CCC not take an absolute position. However, the mark of a Christian is love and sacrifice and the exemplary mother will put her child's life before her own, trusting that God will be faithful in the midst of tragic circumstances.
Adultery is intrinsically evil and never permissible under any circumstances, not only the physical act of adultery (Exodus 20:14), but also adulterous thoughts (Matthew 5:27-28).
Alcohol consumption is permissible and is in fact encouraged in some Scriptures (1 Timothy 5:23, Ecclesiastes 9:7), but moderation is necessary. Intoxication and drunkenness are not permissible (Ephesians 5:18, 1 Corinthians 6:10). The Christian should never drink so much that he or she loses cognitive control and the ability to maintain a Christlike demeanor (Proverbs 20:1, Proverbs 23:29-35).
Anti-Semitism, a form of racism, should never be found in the thoughts, words, writings, or actions of a believer. Gentile believers have not replaced Jewish believers and in fact salvation has come from the Jews. The Apostle Paul likens the entirety of the people of God to an olive tree, which is Israel. Unbelieving Jews have been cut off from the tree and believing Gentiles have been grafted in (Romans 11:17-24), but the roots of the tree remain Jewish through Abraham, Isaac, Jacob, and the King of the Jews – Jesus. In fact, the Bible promises that one day the Jews will return to God and all Israel will be saved (Romans 11:25-28, Isaiah 45:17, Jeremiah 31:1). God gave to the descendants of Abraham through Isaac and Jacob a specific area of land that they still have yet to take full possession of according to the promise. Since God is the ultimate sovereign of the Earth and His Word is true and the land deed still stands, Christians cannot support efforts such as the Two-state Solution. The Bible proclaims that judgment will befall those who divide God's covenant land (Joel 3:1-2).
Contraception is not mentioned in Scripture except in the case of Onan who sinned by preventing his wife from becoming pregnant in order to withhold from her dead husband an heir (Genesis 38:8-10). For this reason only contraception that may result in the death of an embryo or done against the will of one's spouse is forbidden. Christians should be wise about this and research diligently before engaging in intercourse with one's spouse. Drugs such as Plan B are never permissible, but even typical hormonal contraception drugs may result in abortion and their use is thus discouraged. Natural family planning is encouraged and in all cases the husband and wife should be one in heart and mind.
Divorce is inherently evil (Mark 10:11-12), except in the case of marital unfaithfulness (Matthew 5:32). However, even in the case of adultery it is exemplary and most commendable to extend grace and forgiveness and ultimately reconcile with one's spouse recognizing that Christ died for us while we were yet sinners (Romans 5:8) and God has reconciled us by the death of His Son (Romans 5:10).
Embryonic stem cell research is never permissible because the embryos are in fact children in their earliest stage of development and therefore those who destroy embryos are murdering children made in the image of God. The Bible is clear that human life begins in the womb (Job 31:15, Psalm 139:13, Jeremiah 1:5, Psalm 22:10, Exodus 21:22-23) and science is clear that an organism's life begins at conception.
Eugenics in most forms should be understood as evil – especially historic eugenics programs that aimed at eradicating minority populations, killing the mentally handicapped, and murdering the terminally ill. Eugenics continues today in many forms including sex-selective abortions, minority-focused placement of abortion facilities, abortion of babies with trisomy disorders, and many instances of euthanasia. These are all intrinsically evil and Christians should themselves avoid these things while preaching forcefully against them.
Euthanasia, which is the intentional killing of a man or woman by both the perpetrator and the one being killed, is unquestionably murder and must not be committed or advocated by any believer.
Fornication, which is sexual activity outside of marriage, is always sinful (Matthew 15:19, 1 Corinthians 6:9). God created sex to be enjoyed within the boundaries of marriage and within those boundaries there is great freedom for husband and wife. God created sex for building unity between husband and wife (Genesis 2:24, Mark 10:8), for pleasure (1 Corinthians 7:3-9, Proverbs 5:18-19, Song of Solomon 4:1-16), and for producing offspring (Genesis 1:28, Genesis 9:7, Malachi 2:15) and it is only in the context of marriage that these three purposes find their ultimate fulfillment. Men and women in a romantic relationship should not cohabitate before marriage, so that they avoid fornication and the appearance of evil (1 Thessalonians 5:22).
Gender roles are biblical and must be upheld in the Christian community. Men and women are equal before God in regards to intrinsic value and salvation (Genesis 1:27, Galatians 3:28), but nevertheless have been given by God specific callings. The man is the head of his family – not as a coercive force, but as a servant leader (1 Corinthians 11:3). The man is called by God to protect and manage his family well (1 Timothy 3:4), love his wife, and even lay his life down for her (Ephesians 5:25). In regards to church leadership, men are called to exercise authority over the congregation, both in teaching to the collective assembly (1 Corinthians 14:34-35) and in shepherding (1 Timothy 2:8-3:13). Women are called to respect their husbands out of willful humility (1 Peter 3:1) and to help and encourage them (Genesis 2:18). In the Christian community women are uniquely called to teach and disciple other women (Titus 2:3-5).
Genetic manipulation of plants and animals without combining genes from different species is permissible although the Bible does not appear to speak to this issue. Wisdom should be exercised in regards to this issue. However, the creation of hybrid species is unadvisable since God created plants and animals after their own kind (Genesis 1:11, Genesis 1:24). The creation of human/animal hybrids, three-parent babies, or babies resulting from the genetic material of two men or two women are intrinsically evil acts and Christian geneticists should seriously and prayerfully consider the spiritual implications of these creations.
Homosexuality is repeatedly condemned in the Bible as a sin and an abomination (1 Timothy 1:9-10, 1 Corinthians 6:9-10, Leviticus 18:22, Leviticus 20:13), as well as unnatural (Romans 1:26-28). God created sexuality for the purpose of intimacy and pleasure between a husband and wife and ultimately for bringing children into the world. Christians who struggle with homosexuality should flee temptation by any means necessary and should not define themselves by their struggle (1 Corinthians 6:11).
Homosexual marriage is intrinsically evil for two reasons: first, because homosexual acts are sinful and unnatural, and second, because it is diametrically opposed to God's design for marriage, which is repeatedly defined in the Bible as the union of one man and one woman (Genesis 2:24, Matthew 19:5, Mark 10:7, Ephesians 5:31).
In Vitro Fertilization is not permissible for the same reason embryonic stem cell research is not permissible: embryos are necessarily destroyed thus the act of murder is committed.
Marrying unbelievers is not permissible for the committed Christian (2 Corinthians 6:14), though having already been married before coming to faith is a common occurrence. In such a case the believer must remain committed to their unbelieving spouse and through love and faithfulness attempt to win them over with the Gospel (1 Corinthians 7:12-16, 1 Peter 3:1).
Media must be monitored and controlled in the Christian life. There is no justification, artistic or otherwise, for Christians to watch or listen to sinful things for the purpose of entertainment. There is much media a believer can enjoy, but that which is full of cursing, wonton violence, or sexuality is never permissible. The martyr Telemachus stands as an eternal symbol of this truth.
Narcotic use for the express purpose of treating an injury or disease is permissible, but narcotic use for the purpose of intoxication is a great and destructive evil to oneself, to one's family, and to one's society. There is evidence that drug intoxication is partly what was intended when the Bible speaks of the sin of sorcery.
Pornography is never permissible in any form as it is a form of adultery, or in the case of the unmarried, fornication. Pornography also promotes the objectification and abuse of women and children, is by some measures more addictive than heroine, causes permanent emotional and physical desensitization, and even induces early puberty in children exposed from a young age.
Racism is not in accord with the character of Christ who has made all believers one (Galatians 3:28, Romans 3:29) for God does not show partiality (Acts 10:34, Romans 2:11). Believers must not favor the rich over the poor (James 2:1-9), but must show equal favor to all in regards to wealth, station, fame, or race. However, culture has greatly twisted and abused the word racism by extending it to include areas where believers in fact should lovingly discriminate between right and wrong: regarding religion, culture, and sinful behaviors.
Slavery, including and especially sexual slavery and trafficking, is never tolerable. Modern slavery differs greatly from biblical indentured servitude, which in certain times and cultures was lawful, in that modern slavery is illegal, always abusive, and routinely violent and coercive. With more people enslaved today than at any time in history, Christians should advocate zealously for their freedom and protection.
Speech should be Christlike in every way and "seasoned with salt" (Colossians 4:6). Lies, curses, crude joking, and malicious gossip should never proceed from the mouth of a believer (Matthew 12:36, Proverbs 19:5, Titus 3:2, Ephesians 5:4, 1 Timothy 5:13).
Theft is an obvious and unquestionable sin and is not dependent on circumstance (Exodus 20:15). The poor may not steal from the rich even though the rich have more and the poor have less. Instead, the believer struggling with poverty should work diligently (2 Thessalonians 3:10), trusting in God to provide (Matthew 6:25-34), and making his or her needs known openly to the Christian community (Acts 2:44-45). Believers should not take anything unlawfully, including intellectual property, music, or media. Believers selling products or services that they know are scams or falsely advertised are committing theft as well as lying and should cease immediately (Proverbs 11:1, Proverbs 20:23), returning the money that was stolen.
Transgenderism is both sinful and a great deceit. Sinful in that it defies God's created order of male and female and deceitful in that it convinces a person that they can be something that they are not nor could ever be. Christians must refer to a man in masculine terms and a female in feminine terms regardless of how that person may define himself - even if this results in physical, emotional, or legal consequences for the believer. Men should strive for masculinity and women for femininity (1 Corinthians 6:9, 1 Corinthians 16:13), fully embracing God’s design.