Yep - thats the one I always throw at religious homophobes.
@Tea - look, Im not defending the bible for a second, but there are 31,102 verses in the old and new testament. Of them, 3 (the Leviticus ones you've pointed out) explicitly condemn homosexuality. I think its fair to say thats a very small percentage, or in technical terms 'fuck all'.
Like most people, for a long time I assumed that since Christianity was so homophobic, there must be a core of condemnation running through the entire book - but there isnt. If those 3 verses of Leviticus had been lost down the back of the sofa or edited out in one of the many committee meetings there would be little or no religious basis for homophobia.
If we're aiming for rational criticism of religion I think there is at least some responsibility for the skeptic to have an accurate idea of what is being criticised.