Certainty is a pretty strong term to use. Since science wouldn't say it is "certain", then this must be your belief . . .
E.G. time dilation in gravity has been experimentally validated. The experiments have been repeated. The theory of evolution is not in that same category. If the theory of evolution were scientifically validated in that same way, then scientists would have created the chimp using the methods of evolution, and it would be repeatable. OK scientists don't know in detail how that happened, so they can't experimentally verify it. It is a theory, with **some** supporting evidence. Don't get on a high horse about it, either. The theory of evolution does not destroy my worldview if it is true or if it is not true. It is irrelevant to the issue of God creating the Universe. Just may explain how he used some of the natural laws he created to do so . . .
How do you explain life? I have not read everything on evolution, so let me know. I get the idea: there were billions of years, but time is not an ingredient of life. I think the anthropormorphic principle is interesting: all those years would have been necessary for heavier elements to be formed in stars, to make carbon based life possible, etc. (so that, even IF there is intelligent life only on earth, the entire rest of the Universe is not wasted . . .). However, say you have a bunch of organic molecules which formed by chance and chance alone. Say they managed to come together in a form of the most basic one-celled life form. How did it get to be alive? Compare the one formed by chance to the identical one-celled life form which is dead: they will have the same organic molecules. How would either one of those become alive (the one formed by chance and the one already dead)? They could sit there for billions of years and not become alive.
Scientific evidence demonstrates that life comes from something living, not from something non-living. So, what does the theory of evolution hold about life arising, that would overcome all that evidence that life comes from life and not from something non-living? Some "life force" arose? Or, like the old joke about a long mathematical proof, here a miracle occurs? Without a scientifically sound working hypothesis to explain how that posited first randomly-formed cell became alive, it is belief, not science. Belief in the throry of evolution is still faith and not science . . .