Gen. 2:18 – throughout the creation story, God says “it is good” seven times. But when God pointed out that man was alone, God says “it is not good.” God then created woman. Man and woman therefore belong together by God’s design, according to His natural and supernatural law.
Gen. 2:24 – God created man and woman so that they could share communion. This communion is consummated in the marital act (which must be between a man and a woman). This communion is also a reflection of the eternal communion of the Blessed Trinity, who created man in His own image and likeness.
Gen 13:13; 18:20: while homosexuals argue that the sin in Genesis 19 was the sin of “inhospitality,” these verses show that the Sodomites were evil and wicked people before the alleged sin of inhospitality. That is because the Sodomites were guilty of homosexuality, not inhospitality. In fact, 2 Pet 2:6:8 says that Lot witnessed their evil sexual practices “day after day.” The Sodomites’ sin was daily and pervasive.
Gen 19:5: this confirms that the Sodomites’ sin is homosexuality. Here, the Sodomites mistaken the two angels for men and, surrounding Lot’s house, ask to have sex with them. When the yell to Lot “bring them out that we may know them,” the Hebrew for “to know” (yadah) in Gen 19:5 means having sexual relations. See, for example, Gen 4:25 where “yadah” refers to sexual relations between Adam and Eve.
2 Pet 2:6-10: Peter also proves that the Sodomites were guilty of homosexuality. He says God condemned them for “licentiousness” and “lust of defiling passion,” which is where we get the title “Sodomite” for a homosexual. The Greek “aselgeia anastrophes” for lustful behavior is also found in Rom 13:13; Gal 5:19; Eph 4:19 and Jude 4.
Jude 7: Jude also confirms the Sodomites’ sin is homosexuality. Jude says they “indulged in unnatural lust” (Greek, ekporneusasai) and went after “strange flesh” (Greek, sarkos heteras) in reference to their homosexual sins.
2 Peter 2:4-6: Peter also reveals that the Sodomites are suffering in hell for their sins by comparing the Sodomites’ punishment to the eternal punishment of the evil angels. Just as God did not spare the angels when they sinned but cast them into hell, so He did the same with the Sodomites when He “condemned them to extinction and made them an example to those who were to be ungodly.”
Jude 5-7: Like Peter, Jude confirms that the Sodomites are in hell by saying that they had the same fate as the evil angels. Jude says just as the evil angels were condemned to hell, the Sodomites “likewise” (Greek, hos) acted immorally and are undergoing a punishment of eternal fire. “Undergoing” (Greek, upechousai) is a present participle which means their suffering is ongoing. See also the clear polarity between those who are saved (v.5) and those who are condemned (vv. 6-7,11,13).
Lev. 18:22, 29 - God commands a man never to lie with a male as with a female, or he will be cut off. This refers to supernatural death which is eternal separation from God. While the Old Covenant laws have been abrogated by the New Covenant, the Church has adopted their moral principles. Thus, the moral prohibitions on homosexuality still apply in the New Covenant, as Peter, Paul and Jude demonstrate.
Lev. 20:13 - God says that if a man lies with another man, he shall be put to death. From the very beginning, God has revealed that homosexual acts are intrinsically disordered, unhealthy, and mortally sinful.
Deut. 22:5 - cross-dressing is also considered an abomination before God.
Matt. 19:6 - after referring to God's divine plan for man and woman, Jesus says a husband and wife become one flesh, which ultimately reflects God's union with humanity through the Church. Homosexual unions pervert this divine truth of God’s love for and union with the human race.
Rom. 1:26 - also, when a woman lies with another women (lesbianism), this is unnatural and a perversion. God wants His children to be pure and holy as He is holy. Paul condemns all homosexual acts, whether committed by men or women.
Rom. 1:27 – Paul calls the practice of homosexuality shameless, unnatural and a perversity. It is contrary to the natural law, as it eviscerates the life-giving aspect of human sexuality and reduces it to a selfish, pleasure-seeking end.
1 Cor 6:9: Paul teaches that sodomites will not enter into the kingdom of God. The Greek word for “sodomite” (arsenokoites) literally means “male copulation” or “male sexual relations.” The Greek “arsen” means “male” and “koites” means “coitus” or “sexual relations.” Paul uses the same word in 1 Tim 1:10.
1 Tim. 1:10 - sodomites are called ungodly and sinners, unholy and profane, lawless and disobedient. They are called by God to chastity. It is important to note that homosexual attractions and inclinations, while disordered and dangerous, are not by themselves sinful per se. It is the acting out on homosexual attraction that is sinful. Those with homosexual desires can still live a life worthy of Christ by remaining chaste and pure as they abstain from acting out on their desires.