You don't believe that some people are born gay?
Is there any scientific proof or just a matter of faith?
I believe that some might be born with a genetic predisposition to homosexuality, kind of like some are born predisposed to alcoholism or myopia or diabetes. But whereas the latter two are physical ailments, the former is a psychological one -- a state of mind as much as biochemical determinism.
When one reaches an age where one makes decisions, one decides whether to be homosexual or not. No one is born gay.