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Conditions of early Earth are often complicated to recreate, and it takes a lot of simultaneous reactions going just right to make it work - but Earth had billions of years, and we don't have such a luxury. Still, we are very close, and we already created a lot of biomolecules out of basic blocks like water, carbon dioxide, and ammonia.
Humans have plenty of faults in their design - why do we have reproductive organs, which need to be kept clean, right next or combined with exhaust (urethra/rectum)? Why do we have two legs and vertical organization of the body that adds huge gravitational stress? Why do we have pelvis shaped in a way that makes birthing more painful and complicated? Why people with uterus have bloody and painful periods? Why do we have so many vulnerable spots on the body where they should clearly be reinforced? etc. etc.
We also have plenty of rudimentary organs we don't need anymore, that are either just sitting there for no intelligent reason at all, or are actively causing trouble for us (like appendix or wisdom teeth).
This all doesn't fall into the line of intelligent design, unless divine creatures just enjoy crafting us at random and see how we survive anyway.
Sure, they could still do that, they may engineer us in a very odd and imperfect way, they could make our DNA similar to other animals to make us guess if we actually descent from them instead, etc. But this involves so much jumping through the hoops we may as well cut it off with Occam's razor. Evolutionary theory offers clear sequence of how we got where we are, it shows clear relation of all living organisms and the ways they develop into what we know today. So, it wins.