All one needs to do is look at creation to know that there is a God. The universe is a place of order. It obeys rules set in place by our Creator. Rules that the atheist religion of science depends on.
But there is a difference. There is no evidence of an advanced civilization before life appeared on earth. But there is evidence to support the theories. The theories attempt to explain what is observed, not what is believed.
Well, in science a theory must have a form that allows for gathering evidence and proving the theory false if it is false. Your "aliens did it" isn't a theory, because there is no way to test it in that way. Evolution is a theory, because it makes strong predictions on how things work. So, evidence may be gathered and that evidence could well show that evolution theory is wrong. Outside of science, we call almost any idea a "theory" - but, that's outside of science.