Earlier quoted context omitted.
>.. are aligned. Only on Mercator projection that is younger than many of the sites on the line. Oder of things: 1. There were bunch of monasteries (not cathedrals), not aligned on any direct line. 2. Mercator invented a projection. 3. Someone looked at map using Mercator a projection and invented story about ley lines.
You are right, not all the temples in the "line" are cathedrals, which does make the entire story less credible.
So there are a lot of magnificent churches that aren't cathedrals (Sagrada Familia, Westminster Abbey, St. Peter's in the Vatican), and a lot of cathedrals that are actually rather dull architecturally.