I first met Peter Kreeft in a course entitled “Thinking about Religion.” Another professor had warned me not to take his class — so of course I took his class. Kreeft began the semester in a way that still sticks in my memory: “Either God exists, or God doesn’t exist.” Kreeft paused and looked around the room inviting questions, of which there were none. “If God exists, either there is only one God or there is more than one God.” Again, he waited…