Trigger Warning: Some pretty vile views of homosexuality ahead, I spoilered them

I am bisexual, married to a man (didn't figure myself out until recently, probably because of my upbringing...). We both grew up in the same church with very conservative parents.

My husband and I have a gay friend who grew up in our church and because of the anti-homosexual messaging, he attempted suicide. We were both pretty pro-gay marriage already but this was a real turning point for my husband. He wanted to teach more LGBTQ affirming stuff at the youth group but was blocked and eventually we formally left the church over it. We were told again and again to just wait for the big wigs at the church to release the new big report on human sexuality.

I have kept attending a women's bible study because I have some friends and I thought that being a known ally might help. I very openly support same-sex marriage and several people have approached me to talk about it in what I thought was a positive way.

We have really disagreed about what to do. I thought staying at the church and being outspoken allies might help, espeically with those who are undecided and if there are kids who need someone to talk to, my husband said he just can't support an institution that belives same-sex marriage is immoral (the official stance is 1. They were born this way 2. No sex ever. It was progressive when they decided it but obviously not now.) I felt like it was good for us to do the hard work of advocating instead of those who are LGBTQ (even though I now identify as bisexual, but I pass for straight).

Last night I was leaving my bible study when I ran into someone attending a talk about the sexuality report. I asked him how it was and I was not prepared for what he said. It's the LGBTQ people's fault for dividing the church, same-sex love is the same as pedophilia\beastiality/adultery, they need to accept never being able to get married etc. I was just shocked. I live in a more progressive country and I just didn't think people like this still existed. How do I even begin to advocate to someone like this? He wouldn't listen to me at all, it was clear his mind was completely made up. And this wasn't an old guy, he's late 30s with three young kids.

So here is my problem, I thought it was right to stay and advocate, but I could barely speak to this guy. I ended up yelling at him that the church is killing people and they need to stop. I also told him his stance was not accepting to LGBTQ people whatever he thought. I don't think I did any good, it just made me too angry to hear this BS. So now I want to wash my hands of this church forever, but I'm still scared for the kids in this church. Most of them go to Christian school and they do not have easy access to safe allies.

Do I stay and try or should I just leave?