What's the connection between the two?

Millions of atheists around the globe are parents[1]. They didn't magically convert when they reproduced.

Reproduction is well observed in nature. We don't conclude that Thor is real because we look in a microscope and see bacteria reproducing. What would be the connection? What is it about babies that demonstrates a god?

As far as we can tell, there's nothing particularly abnormal about a species reproducing, particularly when it comes to invisible sky wizards.