It has been often noted that Darwin is so important for Atheist-Materialists because it (supposedly) accounts for the appearance of design in living things without a designer. It occurred to me that the multiverse is gaining headway in spite of the fact that it has not been (and in principle cannot be) tested empirically. It (again, supposedly) accounts for the existence of the universe, including its finely tuned parameters for the existence of life, without a creator (accounting for why there is something instead of nothing) or a fine tuning designer.
So there you have it — A-Mat designer substitutes at both the micro and macro levels.