"For God so loved the world, that He gave His only begotten Son, that whoever believes in Him shall not perish, but have eternal life. For God did not send the Son into the world to judge the world, but that the world might be saved through Him." John 3:16-17
FYI: The cities of Sodom and Gomorrah were wicked towns. They were guilty of several different sins and it's very interesting to do a study on em all.. from the context of what these people actually did that hurt the Lord. Go for it. If you like, you can start by looking at Genesis 18:16-19:29, and Leviticus 18. They all were loved by God, but they chose to blow it before God in many areas, but foremost among them all was the serious sin of homosexuality. In that part of Leviticus, God gives clear directives not just for ritual purity, but commands to be observed by every Jew, and even every visitor. Living gay (in Homosexuality) according to God was wrong for the Jews, wrong for the gentiles who visited the Jews ("aliens") and it was even an abomination that defiled the land when practiced by pagans who inhabited Canaan long before the Jews came on in. It's a defiling sin - homosexuality is, regardless of which human practices it. That is from God. It has no place before God among any people, in any age, then or even now. If you are a Calvinist or are into hyper Calvinism and don't feel like evagelizing, please see my comments below.