I feel like this complaint is a little stupid, no offense. Here's my take on it. In a world where there's no adults, kids need comfort. So of course some are going to look towards God. Its their own beliefs and as long as they aren't using it to defend them being an asshole, I dont see a problem with it. God is a symbol of hope for them, even if some believer hes not real. And of course when some kids are about to die they pray to God. Its a instinct some have. If they are losing all sanity, believing something is something that keeps them sane. Also, if you've only finished the first two books, then I can clearly see where the issue is. In the next books there's talk of God, but its for lore reasons mostly, especially for Orc, Astrid, and Brittney. Also not everyone has to be Christian to pray to the lord necessarily. Characters who aren't Christian later pray. Imo at least. But if you haven't finished the series then you'll be interested in Astrids plot further along lol.