Entheogens: The possible Birth of Religion?

I have to credit http://phocks.org/stumble/lsd-history-comic/ and stumble for finding this theory. Pretty interesting. Now this is from what i understood, I may have missed something, so I apologize in advance.

It can be assumed that the plants and therefore the naturally occurring psychedelics in them have been around for a very long time, much longer than humans have. So since the history of time, since people first became, someone must have found one, ate it, and its word spread. Soon tribes would start to look to these plants as sacred, because the people who would take it would experience a spirituality which they took as a sign from a god. To me, that makes a lot of sense, and a little researching on Wikipedia can confirm this (http://en.wikipedia.org/wiki/Entheogen#Entheogen-using_cultures)

Now, this can be taken two ways. One, the evolutionary way, where there is no god, but this is the start of religion. From these plants, people first found something "higher" than them, and they blamed this on a higher being. And the normal consequences that come with passing word down from generation to generation, which creates many different variations, but among them, certain prevailing ones. As different faiths arose, ways of finding spirituality with them changed also, making the use of substances to find faith less mainstream in more different areas, and more mainstream in others.

Also, it can be taken in a religious sense. Assuming that god made the earth, and everything on it, and that god seems to have a purpose for everything, these plants could have been made for us to experience the world of god without having to die and be in heaven. (S)he could have made these to help us become more faithful. The funny thing is that these are pretty much outlawed all over the earth.

Personally, I am not religious, so I am more inclined to go with the first way, but the religious way of taking it makes a lot more sense to me than anything anyone else has tried to tell me, or anything that I have read. I do not completely believe it, but it does make me think.