Science is great when it comes to analyzing natural processes, repeatable experiment, and so forth. But when it comes to evolution, whether chemical or biological, you MUST include assumptions about questions pertaining to God. Such theories depend on a designer not being involved.
Even though God
was involved, the Thoery of Evolution is the best explanation for how He did it. It doesn't matter to the uncanny accuracy of the ToE whether or not a designer was involved nor does the ToE depend on a designer not being involved.
Your premise is false.