Given the SPN world where belief brings tulpas to life, I think your rationalization about number of believers translating to amount of power makes a lot of sense. Of course, the fact that I am against all organized religion makes it easier for me not to be offended when people fail in representing it/them.

But really, I'm commenting because this:

and christianity made it a point to spread and dissemble as much as possible

... made me LOL. Freudian typos much?