The term Sodomites which is often used as a pejorative in our homophobic culture has its origins in the account in Genesis of the destruction of Sodom and Gemorrah. So what was so sinful about the denizens of Sodom. Read this post by The Prodigal Sheep which examines the distorted interpretation of the historical church as compared to the understanding of the Hebrews. Original intent always trumps plain meaning of the text in my book. The Prodigal Sheep writes: Traditional (i.e. post-medieval and modern) discussions tend to focus on a narrow interpretation of the violence intended by the men of Sodom against the two visiting angels, concluding that the violence had something to do with homosexual intercourse, and that for such an abomination God destroyed the city. But the biblical prophets themselves, up to and including Jesus, always understood the 'sin of Sodom' as something quite different.
My understanding is that the specific sin of Sodom was not "sodomy" but denial of hospitality and refuge to the visiting strangers -- which, in a broad sense, can be construed as a lack of charity and compassion.