There are more missteps than favourable ones, but the missteps fall by the wayside and the plusses accumulate.  "Survival of the fittest" is misunderstood as it conjours images of evolutionary warfare.  By "fittest" it means that which is best suited to its environment and hence gradually over time the genes that give a creature an advantage, however small, will replace those that do not. The cumulative effect is evolutionary.

To simplify the your two positions above, we are here due to either:

A natural process, the early moments of which we can currently only speculate about but that developed via a mechanism for which there IS a wealth of evidence; or
Creation by supernatural entity for which no specific evidence exists, by way of a process that no-one has ever even tried to explain beyond "he (she) just did it".

The second option is easier on the brain, but reasonable? 2,000 years ago, maybe, today? No.

"I don't know" is fine. Others are working on filling the god-shaped gaps.