I am not highly or devoutly religious. I believe there's a God and that you should try to live your life to a high moral standard and be kind, helpful, and compassionate to others. But I don't need the bible to tell me right from wrong.
I believe that people are mostly born (pre-natal factors) heterosexual, bisexual, or homosexual. There's perhaps some post-natal factors that contribute, but I think that at most they only contribute minimally. The major theories of how you can 'become' homosexual in my mind are pretty weak.
The reason's I'm gay don't include (aka didn't happen for me):
-I was raped/molested by [insert relative/adult here].
-I didn't have any father/male figures around in my life.
-All my friends when I was young were girls or I wasn't around/didn't associate with many boys, so I felt that I was 'like' girls and 'unlike' boys.
-My mother was too protective/babied me
-Drugs made me do it.
-I was introduced to sex much earlier than most of my heterosexual peers.
-I was introduced to sex much later than most of my heterosexual peers.
-I used to be attracted to girls, but suddenly decided I'd like to hear my friends and own mother talk about how "gay this is" or "faggot this" or my favorite yet; my mom refer to things/people as "all faggoty"
-I'm possessed by Satan, I just don't know it.
-My biological father is a drunk so I'm just rebelling.
-I'm no good with the ladies so I switched to guys.
I think you probably could 'become gay (or at least bisexual) later in life... I just think that's even rarer than being born gay and I'm not sure why or how somebody does that.
At the very least I can tell you for certain it's not like choosing what to wear.
And due to that I think the bible (or at least parts of it and interpretations of it) are human creations subject to just as much bias as anything else written by human beings.
Maybe I'm wrong, I don't claim to be right and I'm probably wrong. I just think if there's a God, he probably doesn't care so much about who you are as how you treat other people.