I read your story. You are having a serious run-in with internet trolls. I call the people you describe "trolls" because, according to the Wikipedia article on Internet troll:
a troll is a person who...intentionally upsets people on the Internet.
Typically they do this by posting inflammatory...messages in an
online...forum...with the intent of ...
Contacting the moderators and letting them handle it is pretty much your only answer.
You cannot get people to do what you want over the internet, especially not if they don't respect you and are only on the forum to antagonize others.
I've been a member of a few forums like the one you mention, both the religious type and the irrelegious type, and both have ...