As much as the Creationists seethe and rage at the thought, life apparently was just a happy accident: just the right conditions at just the right time with just the right elements, and something alive was the result. Assuming there was some sort of 'intellgent design' is just indulging in circular logic, because whoever the 'intelligent designer' was had to have come from somewhere -- and then we're back to the who-made-who conundrum.
Maybe it took a trillion trillion sequences of events all over the oceans of Earth for that one viable single-cell organism to be created. We'll probably never know.
The exact order of events doesn't matter. You exist, ergo all evidence you will find in this universe will be evidence of the natural processes that allow(ed) you to exist.
You might as well think of it as procedurally-generated, like No Man's Sky: as far as you look, as deep as you look, you'll only find evidence of past events consistent with you being alive today. So we *know* what's out there, in broad strokes. There will be no big surprises. It's not like we're going to find that there was a red giant that swallowed Earth a few billion years ago, because that would be incompatible with our existence.
Equally, the future is not so interesting either. What happens tomorrow is restricted by what is fully compatible with what happened yesterday, and happens today.
The present is the conundrum, not the past. Why are we here, now, today?