Sodom and Gomorrah were punished by God for having condoned sexual immorality and pursued homosexual lust

 Jude 7

 Likewise, Sodom and Gomorrah and the surrounding cities, which, in the same manner as they, indulged in sexual immorality and pursued unnatural lust, serve as an example by undergoing a punishment of eternal fire.

2 Peter 2

6 And reducing the cities of the Sodomites, and of the Gomorrhites, into ashes, condemned them to be overthrown, making them an example to those that should after act wickedly.

Saint Augustine

 In his celebrated Confessions, he thus condemns homosexuality:

“Those offences which be contrary to nature are everywhere and at all times to be held in detestation and punished; such were those of the Sodomites, which should all nations commit, they should all be held guilty of the same crime by the divine law, which hath not so made men that they should in that way abuse one another. For even that fellowship which should be between God and us is violated, when that same nature of which He is author is polluted by the perversity of lust.”

Saint Augustine: “Your punishments are for the sins which men commit against themselves, because, although they sin against You, they do wrong in their own souls and their malice is self-betrayed. They corrupt and pervert their own nature, which You made and for which You shaped the rules, either by making wrong use of the things which You allow, or by be coming inflamed with passion ‘to make unnatural use of things which You do not allow.’ (Rom 1:26)” St. Augustine, Confessions (New York: Penguin, 1967) book 3, chap. 8, p. 65. 

 Saint Thomas Aquinas 

Commenting upon Saint Paul’s Epistle to the Romans (1:26-27), Saint Thomas Aquinas, the Angelic Doctor, explains why the sin of homosexuality is so grave:

"Given the sin of impiety through which they [the Romans] sinned against the divine nature [by idolatry], the punishment that led them to sin against their own nature followed.... I say, therefore, that since they changed into lies [by idolatry] the truth about God, He brought them to ignominious passions, that is, to sins against nature; not that God led them to evil, but only that he abandoned them to evil....

"If all the sins of the flesh are worthy of condemnation because by them man allows himself to be dominated by that which he has of the animal nature, much more deserving of condemnation are the sins against nature by which man degrades his own animal nature....

"Man can sin against nature in two ways. First, when he sins against his specific rational nature, acting contrary to reason. In this sense, we can say that every sin is a sin against man’s nature, because it is against man’s right reason....

"Secondly, man sins against nature when he goes against his generic nature, that is to say, his animal nature. Now, it is evident that, in accord with natural order, the union of the sexes among animals is ordered towards conception. From this it follows that every sexual intercourse that cannot lead to conception is opposed to man’s animal nature."

Eusebius Pamphili, Bishop of Cæsarea in Palestine and the “Father of Church History,” writes in his book, Demonstratio Evangelica:

“[God in the Law given to Moses] having forbidden all unlawful marriage, and all unseemly practice, and the union of women with women and men with men.”

Saint John Chrysostom denounced homosexual acts as contrary to nature. Commenting on the Epistle to the Romans (1:26-27), he said that acts of sodomy are an unpardonable offense against nature. They are doubly de structive because they threaten the species by deviating the sexual act from its primary end of procreation, and they also sow disorder between men and women, who are no longer inclined by physical desire to live together and in peace.

The brilliant Patriarch of Constantinople employed most severe words against this unspeakable vice. In fact, Saint John Chrysostom argued that there was no more de praved act than this:

“All passions are dishonorable, for the soul is even more damaged and degraded by sin than the body is by disease. But the worst of all passions is lust between men. .... The sins against nature are more problematic and less satisfying, so much so that one cannot even say that they procure pleasure, since true pleasure is only that which is according to nature. But when God abandons a man, everything is turned on its head! Therefore, not only are such passions [of homosexuals] satanic, but their lives are diabolic .... So I say to you that they [the homosexuals] are even worse than murderers, and that it would be better to die than to live in such dishonor. A murderer only separates the soul from the body, whereas these [homosexuals] destroy the soul inside the body. .... There is nothing, absolutely nothing more absurd or damaging than this perversity.”

“Consider how great is that sin, to have forced hell to appear even before its time!… For that rain was unwonted, for the intercourse was contrary to nature, and it deluged the land, since lust had done so with their souls. Wherefore also the rain was the opposite of the customary rain. Now not only did it fail to stir up the womb of the earth to the production of fruits, but made it even useless for the reception of seed. For such was also the intercourse of the men, making a body of this sort more worthless than the very land of Sodom. And what is there more detestable than a man who hath pandered himself, or what more execrable?” 

In a sermon at the Church of Saint Mary of Por ciuncula, Saint Bonaventure spoke about the miracles that took place at the very moment of the birth of Our Lord Jesus Christ. The seventh prodigy was this: “All sodomites, men and women, died all over the earth, as Saint Jerome said commenting on the psalm ‘The light was born for the just.’ This was to make it clear that He was born to reform nature and to promote chastity.”