Even assuming that the bible somehow clearly forbids homosexuality, the fact remains that God doesn’t seem to have magically given us a 100% foolproof method of interpreting the bible. Especially because the act of reading and understanding any piece of text requires all kinds of assumptions and knowledge that is external to the text itself. Assuming that a text is described as being 100% true, such an assumption is only fully meaningful if it comes with a simultaneous assumption of how that so-called 100% true text is meant to be read to produce in people’s minds a 100% true interpretation.
The religious zealot can simply declare that “homosexuality is wrong because the bible says it’s wrong”. But who gave him the right to assume that his way of using the bible is the God-intended way to do so? Where is the booming voice from heaven that declares that the bible is always right, or that we are using the bible in exactly the way God intended?
The above is especially relevant because presently, the strongest argument against homosexuality relies on the idea that “the bible says it’s wrong so it must be wrong”. But it is not so obvious how homosexuality is intrinsically wrong, because it is not obvious how it necessarily causes harm to anyone.
The Christian zealot who refuses to examine his own unjustified assumptions about the bible, is simply being a hypocrite when he insists that homosexuals should examine their own assumptions about the rightness/wrongness of homosexuality.
In the end, when neither side is willing to examine their own assumptions, it just degenerates into a pointless shouting match.