I happen to agree with you. I don't believe all gays are 'born gay, but I think many are . Notice....
Dr. Gregory Dickson, whose doctoral thesis is on the relationship between a mother and son in the development of homosexuality, found that 49% of the homosexuals he surveyed said they had been molested, compared to less than 2% of heterosexuals. That leaves 51% that don't fit his pattern.
There are many gays that have physical characteristics that can't be explained by learned behavior.