Here's how I've scored each individual Gospel:
Matthew: 19
Mark: 11
Luke: 16
John: 13
Still rather high, especially Matthew's score.
My combined score, 18 1/2, is lower than Matthew's because of Luke's Temple-prodigy incident. That's a little bit about JC's childhood, though not as much as for (say) Krishna.
List of Lord Raglan evaluations - Atheism