Suppose we are in a lab and lets call it Heaven. And suppose I have a cage with rats in it as well as an ecosystem to sustain the rats as well as the power to do anything I can conceive of with these rats. Perhaps out of curiosity, I want to give the rats reason and free will, but also a conscience to discourage them from eating each other (I suppose it might be argued that they already possess this). Now we have some reasoning rats and we can observe to see what they might do. They ought to be reasonably blissful, ignorant but curious about their world. Perhaps a little fitful, wanting to understand their place. Gradually realizing their ignorance. It's my goal to see what they'll do, so I don't want to be involved. After all, if they figure out that I gave them the ability to reason they would rightly be in awe, and that knowledge would surely change them. It's okay though, I gave them reasoning so they should inevitably be able to see me when they're ready to confirm suspicions. There are billions more people like myself who don't know or care about my little experiment, but there will probably be a few who stumble upon it. They don't know or don't care that I just want the rats unmolested, so they might do something mighty and see if the rats will do a song and dance for them. Perhaps give them some instructions about how to treat each other, with good faith or with bad... you can't be sure with us humans. Where before there was a blissful curiosity, it is replaced by a conflict between skepticism and certainty. With a higher authority, the certain can now put aside their conscience in the pursuit of a divine right. The skeptical rats go first, and then the remaining rats turn on each other breaking down their certain scrolls into certain scraps of fought-over papers until the last rat remains, bleeding and starving to death. Now my experiment is ruined! What has this stranger done? He created religion. Well, for all I know, the rats might have created religion themselves given enough time. Not that the results would seem any different. Maybe I just oversimplified the fate of man. I don't even have to claim this story is true, because I'm sure the religious will accept it when I say that it cannot be proven to be false.