I am neither gay or bi and I have no religion or believd in god so am probably not the ideal person to answer this question
I know that I knew very early on that I was attracted to women so I'd assume that for many gay men and women they just know themselves at earlyish
age although because of the way society makes such an issue of sexuality they may repress or deny it to themselves for a long while.
Now as to religions assertion that it is a sin,that it is wrong and against god's law where do you start ??
If you follow the bible which parts do you consider no longer relevant in our modern 'christian' age and which do you hold fast to ??
I think though if I was gay and I was told that god loves the sinner but deplores the sin it would seem a rather condescending attitude to me.
Does god sent gays to hell yet allow bisexuals through his pearly gates ??
Why not a bishop can spend his career buggering choirboys then ask forgiveness and secure a ticket to paradise so with that kind of glaring hypocrisy
on display it seems god isn't that fussy !!!!
Personally,if he does exsist I don't want anything to do with him or his law