Taking it to mean that this is a non-believer forum is just as wrong as imagining it should be a believer forum.
It's a discussion forum. It's meant to discuss things, not be an echo chamber.
Like discussions of anything else, if you are telling me something personal like what flavour ice-cream you like then I don't need proof. I'm willing to accept it because the implication if you are lying is nothing. If you make a claim about some science or political stats then I may ask for a reference and if you can't back up your comments I can feel that you are just making things up. Things matter more when I care if misinformation is being given out.
Why should discussion of religion suddenly get a fact-free get-out-of-jail pass?
Like anything else, you can say something is what you feel or believe but you can't just state things as facts and get pissy if people then question it.
So again, if you say "I choose to believe that there is a super-being who loves me" you'll get less push-back than if you say "there is absolutely a super-being that loves me".
But if you think you constantly need to tell everyone about your super-being super-friend who has a crush on you? Well, we may just think that you are an annoying idiot.
Find a balance, have a self-filter.
If you want an echo chamber where everyone agrees with your definition of god and shares your belief in him - go to church !!