The Bible is about God, right? Then how can a whole book that doesn’t mention him make it into the Old Testament?
The book of Esther doesn’t mention God once. Does that mean he isn’t part of the story? Oh course not! God is a part of every story. And not just the ones that make it into the bible, either. He’s part of every story that could ever be told about this world.
Just because God’s name isn’t being mentioned somewhere doesn’t mean you won’t find him if you look for him. Just because you didn’t pray yesterday or read your bible, doesn’t mean he wasn’t active in your day. Sometimes God is ignored, sometimes he is silent, but he’s never absent.