I want the strongest possible set of information for this and any other question so we can make informed decisions. Right now there are more questions than answers.

It's just like intelligent design and the "god of the gaps" arguments, where the space God/gods could have done their work slowly shrinks as our understanding of the world around us improves. I have no clue if we'll ever close all the gaps, but every time intelligent design takes a hit, more people jump ship.