Evolution is certainly a fact (you know me - I'd go even further but I find Snail scary). The theory that attempts to explain it is just that, a scientific attempt (meaning that the evidence used to construct the theory must be obtained by the scientific process). It's a very good one, though, because the evidence makes evolution incontrovertible. Only a fool would deny that. Whether or not evolution undermines God (at best, it makes him redundant) is of no concern to science.