The Bible originally said (and a Christian who studied theology told me this) "man shall not lie with a beast" In ancient times being gay was not an issue, the continuance of the human race was, people were told who to marry and expected to have children. No doubt there were Lesbian and gay love relationships. You only have to look at ancient Greek archeology to know this. Anyway King James changed it to "man shall not lie with another man" By this point population is higher, people have less need to breed and King James was a bit crazy. He changed "thou shall not suffer a murderer to live" to "thou shall not suffer a witch to live" so he could kill innocent people, mainly women. Those women were generally hung not burnt - another fantasy fed by Hollywood.
So in reality Christianity had no message regarding same sex issues. We're over populated so really we should be encouraging gay marriage all over the world.