Saint Thomas Aquinas, commenting on Romans 1, points out that sodomites are idolaters.

“Why, I ask, O damnable sodomites, do you seek after the height of ecclesiastical dignity with such burning ambition? Why do you seek with such longing to snare the people of God in the web of your perdition?” St. Peter Damian


St. Paul points out in Romans 1:32 that homosexual activists are sodomites.

St. Thomas Aquinas: Vices against Nature Are Also against God
St. Hildegard of Bingen O.S.B: Homosexuality is the Supreme Offense against God

Saint Bernardine of Siena: "the vice of sodomy ... is the greatest sin."

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Furthermore, St. Paul warns in 1 Thessalonians 4:6 that no one should sexually abuse his brother, and a homosexual/pedophile who sexually abuses his brother not only sins against his own body but also murders his brother.

Both sins are among those that cry out to Heaven for vengeance. Sodomy is a spiritual suicide that murders one's own body.

Nothing is more evil than trying to kill God.

That's precisely what pedophiles do.
‘Truly, I say to you, as you did it to one of the least of these my brothers, you did it to me." Matt 25:40.

Sodomy is horrific but the greatest sin is abortion because abortion is attempted murder of Jesus Christ. "And the King will answer them, ‘Truly, I say to you, as you did it to one of the least of these my brothers, you did it to me." Matt 25:40.