Just discovered this a couple of weeks ago, have seen S1 and S2 and am into S3. I was very, very skeptical at first, with actually more criticisms about the acting and trivial setting issues.
I’m more into it now, still find it a little stiff but now enjoying the historical digressions. I have looked things up because of the back stories...was Andrew really that close to John the Baptist, etc.
Short answer the close friendship between Andrew and John the Baptist I believe is historically accurate. I believe most scholars would agree that Andrew was one of “creepy John’s” earliest students