There are people who will loudly trumpet extreme sides of each in-game argument despite them all clearly being designed to be complex areas with no obvious"right" solution. It seems some people like to shoehorn black and white views onto landscapes that are clearly many shades of grey. Maybe they enjoy extending their RPing onto the forums. Maybe they are trolling. Maybe they just don't get it. Maybe a mixture of the three...
I never ever troll. Or RP. Ever. Really. 
Mage-Templar debates are the worst for this. At it's core it's about whether you value safety for the majority or liberty for a minority. The devoutly pro-mage fans in particular tend to completely disregard the idea that safety is even a real concern and deny the many good reasons to believe the Circles are needed and the Templar Order has a place. Most Templar fans I've seen take a more balanced approach and recognize that the system sucks for mages (with differing beliefs about how badly and how much the system needs improving) but favor the pragmatic approach to public safety.
I'm an atheist and I don't rule out the fact that a God could exist in the real world. I just think it's hugely unlikely given the lack of credible evidence and the plethora of contradictory "true religions". I generally tend to have my characters reach the same conclusion although this time I'm RPing an Andrastean.
Agnostic atheist here. I am far too cynical to ever firmly believe in something that can't be proven. But I respect the people who can. I think faith can be a wonderful thing, and by it's definition doesn't need evidence. One of the reasons I find it so irksome to see people dismiss the Andrastian faith and it's importance to the characters of the setting. Particularly because while the Elven Pantheon and Tevinter Old Gods have been clearly defined as beings beyond most mortals but not capital G Gods, there is no lore based reason to believe that The Maker isn't real and isn't that kind of god. Although, if the new lead writer doesn't stray from the original gameplan, it won't ever be proved or disproved because it's intended to be a matter of true faith.