Won't be trying to make you to give up your faith bring the opposide effect?
The only thing I can do is make you think on and give you points ro rethink particular points of some parts of the believed things. Like your believe that homosexuality "is a sin".
As you said: You maybe wrong. I think (and believe) on that certain point you are wrong, but I do not hing that you are wrong to have a strong faith in christianity and god.
I do not whish anyone something such strong and bad that make him or her loose the faith.
I think we both could agree on some things:
One bad thing is that some (maybe much) religios people are not only believe something is a sin, but they also believe that they have to judge people.
Another bad thing is that extreme poeple of a group of people can give the whole group a bad public flavour.