The WT published ONE book years ago that skimmed several religions, pointing out their faults. (I can't remember the name.)
Mankind's Search for God. I LOVED the pictures in that book. In the front there was a dude getting his heart carved out of his chest as an Aztec sacrifice; in the section on Buddhism or Shintoism there was a scroll depicting hell, which I thought was pretty fascinating. The pictures of all those gods and crazy looking hindus was quite the treat.