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Looks like you have already fell victim to their propaganda. The part where they tell you that people are born gay.
"Being Gay" or a being a homosexual is a BEHAVIOUR it is NOT an immutable, morally neutral characteristic like one's ethnicity or gender.
You might as well ask "How can someone teach a good kid to be bad?"
So then, if you had, say, a man who was attracted only to other men, and he went off and became a hermit and had no relations of any sort with any humans whatsoever, he wouldn't be gay? What would he be?