If God made the gay people, why is being gay a sin?

Some people are born naturally gay. Nobody chooses to be gay. I didn’t choose to be heterosexual and if you put a gun to my head, I couldn’t “choose” to be sexually attracted to men. So, that either means that homosexuality is natural with a god not existing or a god existing. If it is a god existing, either being gay is a combination of genetic and/or environment (hormones affecting the fetus while a mother is pregnant) or this god is “making people gay.” A god condemning people for being gay, if he made them gay or through natural processes, would of course be a bad and unjust god. Hence any god condemning gays is a bad god, if true.