God, Santa, and The Tooth Fairy

[Belacqua]

How can theists be sure they’re doing anything more than simply guessing or pre-supposing without justification?

Nobody should be sure. People who say they're sure are just telling you they don't understand the problem. 

Polymath does a good job of laying out one view of the issue. The last line of his post shows that he's not going to try to understand the main historical counter view. Nudger doesn't know what he's talking about. 

I apologize, but I'm not in a position at this moment to tackle this, which I'm sure you see is a huge problem. 

The Stanford Encyclopedia, as always, gives a good and serious introduction to the problems. 

https://plato.stanford.edu/entries/physicalism/

I'm impressed by your personal news, and I'm wishing you only the best during what must be a joyous and also stressful time. Please take good care of yourself, and feel free to jettison all discussion of metaphysics when other concerns take precedence. We will certainly understand!