Homosexuality is first mentioned (and condemned) in Genesis 19, when the men of Sodom gathered around the house that Lot is staying in and want the men to come out so that "we may know them", or in other words, have sexual relations with them. Modernists claim that "know" here refers to getting acquainted with, that "know" is usually used in the Bible with this meaning, and that Sodom was destroyed for the sin of inhospitality.
However, the word "know" is used 12 times in the book of Genesis, and out of those 12 times, 10 times it means sexual intercourse. This is supported by the fact that Lot offered the men his two virgin daughters. The obvious reason he did this was because the men of Sodom wanted to have sexual relations with the men in the house, and by offering his daughters, Lot felt as though they would leave the men be and have sexual relations with his daughters instead of with them. Jude reinforces this interpretation when he says: "Sodom, Gomorrah, and the towns there about indulged in lust" (Jude 7). According to Ezekiel, Sodom "did not aid the poor and needy" (Ez. 16:49), but homosexuality was clearly the main reason behind the destruction of the city.
Leviticus also condemns homosexuality: "Do not lie with a man as one lies with a women; that is detestable" (Lev. 18:22); "If a man lies with a man as one lies with a woman, both of them have done what is detestable" (Lev. 20:13). Modernists argue that these verses apply only to the ritual purity of priests, as they appear in the Holiness code. But ritual purity reflects moral purity, and to hold the Modernist position, adultery (Lev. 18:20) and bestiality (Lev. 18:23) would be acceptable. Some Modernists say that Old Testament prohibitions against homosexuality no longer apply today. But if this is true, than it is logical to say that other prohibitions, such as bestiality, adultery, and incest, that immediately surround the prohibition against homosexuality, no longer apply today. The fact is, the moral law remains in force, while the ceremonial and ritual aspects of the Mosaic Law no longer apply (Gal. 3:13, 6:2). Since homosexuality is a moral requirement, rather than a ceremonial or ritual one, it is binding on all people, in all places, at all times.
The other problem with the latter argument is that the New Testament condemns homosexuality as well: "In the same way the men also abandoned natural relations with women and were inflamed with lust for one another. Men committed indecent acts with other men, and received in themselves the due penalty for their perversion" (Rom. 1:26-27). "Do you not know that the wicked will not inherit the kingdom of God? Do not be deceived: Neither the sexually immoral nor idolaters nor adulterers nor male prostitutes nor homosexual offenders nor thieves nor the greedy nor drunkards nor slanderers nor swindlers will inherit the kingdom of God" (1 Cor. 6:9-10).
Modernists claim that there is a genetic predisposition to homosexuality, and if God made them that way, then homosexuality cannot be wrong. Of course, this assumption has yet to be proven. And even if it is so, this does not justify homosexual behavior. Some people have a genetic predisposition to alcohol, and yet, this does not justify their abuse of alcohol. Those with a disposition towards homosexuality, even if such a thing exists, must remain chaste, while those with a disposition towards alcohol must remain sober.
Modernists claim that since ten percent of the population is homosexual, it is normal behavior and is therefore acceptable. But one hundred percent of the population sins in one way or another, and by this logic, sin should be considered normal and therefore acceptable. Modernists also use the ad hominem tactic of calling those opposed to homosexuality "homophobes". This is an unfair charge, as most Christians are not afraid of homosexuals–they simply oppose homosexual behavior. Even if the charge was true, would someone who fears a burglar be unjust in wanting that burglar locked away so he could never commit burglary again?
One of the purposes of sexual relations is procreation. All sexual acts must be open to the transmission of new life. Since sexual relations with someone of the same sex cannot possibly result in new life, such relations are immoral. The sexual act was created by God to be entered into only by a man and a woman.
Tertullian (Modesty 4 [A.D. 220]) "All other frenzies of the lusts which exceed the laws of nature, and are impious toward both bodies and the sexes, we banish, not only from the threshold but also from all shelter of the Church, for they are not sins so much as monstrosities".
Cyprian of Carthage (Letters 1:9 [A.D. 253]) "Oh, if placed on that lofty watch-tower, you could gaze into the secret places--if you could open the closed doors of sleeping chambers and recall their dark recesses to the perception of sight--you would behold things done by immodest persons which no chaste eye could look upon; you would see what even to see is a crime; you would see what people embruted with the madness of vice deny that they have done, and yet hasten to do--men with frenzied lusts rushing upon men, doing things which afford no gratification even to those who do them".
Eusebius of Caesarea (Proof of the Gospel 4:10 [A.D. 319]) "Having forbidden all unlawful marriage, and all unseemly practice, and the union of women with women and men with men, he [God] adds: ‘Do not defile yourselves with any of these things; for in all these things the nations were defiled, which I will drive out before you. And the land was polluted, and I have recompensed iniquity upon it, and the land is grieved with them that dwell upon it' [Lev. 18:24-25]".
Basil the Great (Letters 217:62 [A.D. 367]) "He who is guilty of unseemliness with males will be under discipline for the same time as adulterers".
John Chrysostom (Homilies on Romans 4 [A.D. 391]) "All of these affections [as found in Romans 1:26-27] . . . were vile, but chiefly the mad lust after males; for the soul is more the sufferer in sins, and more dishonored than the body in diseases".Augustine (Confessions 3:8:15 [A.D. 400]) "Those shameful acts against nature, such as were committed in Sodom, ought everywhere and always to be detested and punished".