The people of Sodom & Gomorrah threw a drunken party, surrounded by aoil, alcohol, and torches, and turned their cities into a giant crate. Obviously, they couldn't ban alcohol, especially in the sanctity of church, so they needed a skapegoat.
I guess rather than say, "We learned from this to be more responsibile around alcohol, especially if things that can be set on fire are nearby," they went with, "Kill The Gays!"
Makes sense.