Sans is pretty sure a Bible is a human religion thing, but 'human religion thing' is the extent of his knowledge. Well, Daylight isn't (supposed to be) a human, judging by his network posts, so it shouldn't be weird if Sans just doesn't comment on it specifically at all. Prayers for Children, though...

"Maybe you should'a told Santa how old Agatha was in your letter. But it doesn't look like it's shooting out magic laser beams or anything, so I guess it's fine."

Okay, that probably wouldn't happen. Everything had a theme; it would clearly be magic ice beams.