Evolution theory is no such thing. It may be true that many evolutionists go all they way and assert that there is no God, but that is their religious belief, not science. Scientific evolutionary theory merely tries to establish the physical processes that have resulted in the bioligical diversity that we observe today. Even Darwin acknowledged that God might be behind it all, but that is the province of religion.
That is really the problem with ID advocates. ID seeks to establish that there is an ultimate cause, which is not a scientific proposition because it can't be proven or disproved. It is a religious proposition. It may very well be true, and you and I may think so, but let's keep it out of science. Let's be realistic. ID proponents are really antievolutionists. ID is an attack on science, period.
What if a supernatural being suspended natural laws of the universe in order to accomplish this? Would this be detectable by science?
And if not, then the scientific, naturalistic, answer is going to be wrong and will never know that it is wrong.
It's certainly OK to assume there has been no supernatural intervention and proceed to do science from that starting point. But just don't pretend you've ruled out God. Because you haven't.