No one mentioned any scientists. A petri-dish doesn’t have a scientist living in it making the little critters grow (that is, unless you are into the whole new-age, quasi-quantum physics stuff about nothing existing without an observer), it is just chemicals reacting. The entire world’s environment through out its millions of years of history has far more chemicals and variables than can ever be imagined in a ‘lab’.
From my view, just like an architect, God had all this in mind before the first spark of the big bang. No need to come along and fix it and push it along. From the first atom striking another atom, the process was in place. An architect doesn’t figure out how to build something as he goes along, it is all a concept before the first nail is hammered.
Which implies someone to build it.
An architect’s concepts don’t build themselves.