As I said before, creationism arose from the need of early humans to have some meaning to their life. There is no proof. And, like I said before, there is nothing wrong with that--it is something that probably every culture in the world has thought about at one poing or another.
Evolution from one species to another IS proven. How else would we have ended up with such similar genes to that of an ape? It's not coincidence, that's for sure. So lemme thing... hmm... maybe it could be... evolution? All evolution is, really, is life changing according to various stimuli (both internal and external--genetic mutations can cause an organism to change and so can its environment) in order to, well, survive better. So doesn't it make sense that if an organism was forced to change enough, it could become a new species? Evolution from one species to another is simply one part of a species breaking away from the rest and, over millions of years, changing so much that they are no longer the same species.