That's fair enough. I've not read up on exactly what's what. I do think gay people should have precisely the same legal rights with regards to marriage as heterosexual people, but I don't think a religion should have to add their 'blessing' to that if it's against their 'rules'. (At the same time, I wouldn't state fund anything to do with religion.)
I always assumed The Bible forbids homosexuality (or at least certain sexual acts), but what do I know? It's all one big fairy story as far as I'm concerned anyway.
The bible says lots of things. Most are ignored for common sense reasons. The passage you're referring to is no more explicit than those condoning genocide.
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As for people of the cloth being given the right to choose - fu(k that. There is no compromise to be drawn.
As long as people have the right to hierarchical discrimination, people will exercise their right to be lairy about it. 'Acceptable discrimination' is not acceptable. Not ever. No. Not even then.