Bridging an incomplete empirical claim with belief for the sake of undercutting a belief in God seems to run contrary to a great atheistic argument.
The above discussion did not "undercut a belief in God." It simply reduced the validity of one of the bits of evidence that theists have used to claim God is real i.e. that there could not be any life without God.
This approach by theists - "God of the gaps" - is surely valid, but is also doomed to failure in the long term in most instances, since it relies upon science not advancing. It also makes for a pretty precarious position.
"God makes the Sun rise and set!" - Nope. Turns out we orbit around the Sun, and spin at the same time.
"This most beautiful System of the Sun, Planets, and Comets, could only proceed from the counsel and dominion of an intelligent and powerful Being.' - Nope. Turns out that plain ol' physical laws regulate that.
"God made man; he didn't come from monkeys!" - Nope. We know exactly how much DNA we share with our most recent common ancestors, who begat both humanity and chimpanzees.
"I'll tell you why [religion] is not a scam. In my opinion, all right? Tide goes in, tide goes out. Never a miscommunication.
You can't explain that. You can't explain why the tide goes in" - Nope. (Bill O'Reilly actually said this.)
"Bananas are evidence that God exists" - Nope. (Ray Comfort) Turns out natural bananas are almost inedible.
"There were no complex molecules on the Earth before we existed - God must have made them!" - Nope.
What some other theists had to say about this approach:
Dietrich Bonhoeffer - "How wrong it is to use God as a stop-gap for the incompleteness of our knowledge. If in fact the frontiers of knowledge are being pushed further and further back (and that is bound to be the case), then God is being pushed back with them, and is therefore continually in retreat. We are to find God in what we know, not in what we don't know.
Charles Alfred Coulson - "There is no 'God of the gaps' to take over at those strategic places where science fails; and the reason is that gaps of this sort have the unpreventable habit of shrinking."