Every single video ends on a black screen with a silhouette of a mouse wielding a sword with a Bible verse (just the book and number, not the actual text) on it.
Edit: this is more of a how did you miss it than he’s religious, it’s in every single video, rather that an exhaustive list of where it leaks into the main parts of his videos. I stopped watching him, I’m not going to go combing back through to find examples.