Excellent response, Alise.  In ancient Greek, no word existed in their vocabulary that referred to our modern concept of "homosexuality."  There are very few verses in the bible that even remotely try to speak to same-sex matters, and I would agree with Alise that what the biblical authors decried was, more precisely, sexual immorality--being sexually loose or, as Alise puts it, idolatrous, with whomever/whatever crosses one's path.  The Bible has lots more to say about "sinful" situations between men and women, ranging from lust to adultery to divorce, etc. (but no one today is seriously trying to criminalize these "sins").  Ancient cultures hadn't yet formed the concept of two consenting adults of the same sex who mutually loved and committed themselves to one another as married couples do today.

But like I said, I am an atheist (after having spent many years as a very sincere and well-meaning Christian).   I understand that I have strayed onto Christian turf by finding and commenting on this site, but if you could humor me for a moment: the fact of the matter is that appealing to the authority of the Bible means nothing to me, or to other people who view it as a collection of books written and compiled by fallible men.  If you really want to pull out a small, isolated handful of verses as support for labeling same-sex relationships as sinful, and you want the law to enforce those views on the rest of society, you will have to reach out further to find some kind of extra-biblical common ground with people who don't view the Bible as an authoritative voice on matters of public policy and 21st century concerns.

I appreciate Alise's reply, because at least as a Christian, maybe her voice will carry beyond the reach of mine to engage her fellow believers in discussions like this.  As an outsider, my perspective is usually dismissed outright, with the rationale that I have been blinded by Satan and the lure of secular society.  But I think there is room for Christians to approach their own book of scripture with a more careful and critical eye, and come away with a deeper understanding that differs from traditional interpretations of the same text.  With the "culture wars" raging, I do think that many people simply see what they want to see (or what others have told them is there) when reading between the lines printed in the Bible.  Please, Christians who are more receptive to marriage equality and similar values:  please let your voices be heard, please keep engaging with your own communities to help move us all beyond injustice and backwards thinking.  As a non-believing outsider, I fear that my hands are tied.