When the current Sciforums owners took over, we had a discussion about what we (at the time the moderators were polled) wanted for the sites direction since the owners didn't really want to make any huge changes.
We look at what would happen if we headed towards a pure science site, this would of required "Quality Control" on thread creation (Having an Editor overview articles), it would of likely required more information from moderators and posters alike (resumes, qualifications etc) and discussions would be streamlined to be more in-tune with true science than the current layperson discussions we have now.
(A encyclopaedia was even added just in case a more professional direction was turned, it would of given the ability to create articles that sciforum's members collaborated on.)
It was assumed that if the site evolved into a more specialised academic model that it wouldn't appeal to such a large audience and that traffic in the long run would dwindle, it was also proven by the members at the time that they preferred a more "casual" approach to scientific discussion. This is because not everyone has an alphabet of academic credence after their name, this forum was populated by people that might work in some positions of science (researchers, assistants and the like), writers and people that have interests in certain topical discussions. Sometimes they would "let their hair down" and we'd have people that clowned about (which isn't something that would have been tolerated on a stringent science site).
So we decided that the site should be a popular science site, while Science is what it's defined for, it meant we'd create more room and leeway for things that aren't so scientific, like pursuits of philosophy, history, politics, religion etc. (Things that would fall more into Humanities or "soft sciences") along with things that were purely cultural, albeit they could be a subset of psychology (conspiracies, pseudoscience, Scifi etc)
That's why there is a Religion subforum, it was also handy because if anyone claimed something religions in regards to any subjects, it had a subforum to be moved to because of it's agenda driven reasoning, which meant it was given a place rather than just being dumped in the Cesspool.
The religion subforum didn't really get moderated initially because most of us aren't interested in religion in the slightest. The problem is however having a religion subforum brings out two types of people, those that want to spread the word of whatever god they believe in and those that want to just state how much 'cacca' religion is. Both are extremists in their own way and neither are really there for actual discussion, just promotion of their own egocentric position.
The religion subforum should stay just for trying to keep the site tidy. (However I do question whether posters should be rewarded a post count for posting there.)