Adults continue to permanently turn away from homosexuality, even after decades of believing the lie they were “born that way”, proving it’s not genetic, but the product of indoctrination, confusion, mental instability and/or abuse.

Homosexual behavior is most literally pointed out as a sin, and God has not changed on that regard. But if a person has those inclinations but does not act upon them, does not dwell in lust upon others, but is instead struggling against them to avoid them, then it's not a sin. It's just like sinful inclinations of any kind: it's acting upon it when it becomes a sin.