You say X is guilty of murder. I say, no, he's innocent. You say, well, then who did it? If you say X didn't, you've gotta tell me who did! I say, I don't know who did. (Or, in this case, I say I don't know how the process went.)
Sure, that's perfectly fine. And that's one of the reasons I don't see a conflict between evolutionary theory and the Bible. The book of Genesis dealt with the mechanics of creation in only a superficial sense - the important stuff was who did the creating, and what was the end result. The aim of science is to reduce - complex phenomena to simple phenomena. So science tries to describe the physical process of how creation occurred using the physical evidence available. It's not a "proof" - just a best guess based on our current knowledge (same as all other science).
That's why I don't understand the conflict between the Bible and evolutionary theory - they simply don't address the same issue.