Jesus calls for one flock and One Shepherd. John 10:16.

Christianity follows human shepherds instead of Jesus, the Shepherd. Each of the arms of Christianity gives and does obeisance to its human shepherd: Charles T. Russell, Ellen G. White, Joseph Smith Jr., the Popes, etc. Luke 14:27

And other sheep I have, which are not of this fold: them also I must bring, and they shall hear my voice: and they shall become one flock, one shepherd.  John 10:16 ASV