I think there is some great “theology” portrayed in many of the strips. In fact a somewhat controversial book titled “The Gospel According to Snoopy” was floating around decades ago.
One of my favorite cartoons was Linus and Charlie arguing about the Great Pumpkin. Charlie asks Linus how he can believe in such a thing; Linus retorts that when Charlies stops believing in Santa Claus, Linus will give up on the Great Pumpkin. Charlie closes the strip by saying, “We are obviously separated by denominational differences.”