1. I don't even believe OOP's premise. There might be a majority with prayers at the end but I don't think it's every single one.
2. I think they only care about the US. It's not selection bias but ignorance about the rest of the world.

That said, OOP's argument wasn't that their god is real but that deep down, everyone is religious. Still they made it into a truth claim about their religion. The commenter took the truth claim and ran with it.

I thought about putting "/s" in my first comment but it didn't feel quite right. It was more a thought experiment. Applying selection bias to the reply. It was only the second comment when I entered troll mode.

The comment is obviously sarcasm / a joke

Making the sarcastic statement that "we don't hear about god saving planes at the last moment but it does happen"

Did you mean Poe's Law? That would imply you only made the claim about divine selection bias sarcastically, and we all just thought you were being serious.