The best replacement for priest is warlock.

The best alternatives to priest are rated as following:
★★★★★  warlock
★★★★★  mage
★★★★  pastor
★★★★  druid
★★★★  shaman
★★★★  paladin
★★  monk
★★  rogue
★  minister
★  mystic
★  hunter
★  deacon
★  mystic tera
★  warrior
★  iron maiden
★  warlock 5.4
★  mage 5.4
★  monk healing
★  monsignor
★  paladin healer
  shaman 5.4
  rabbi
  paladin hearthstone
  druid hearthstone
  holy priest
  jesuit priest
  reverend
  prophet
  pally
  dk
  high priest
  levite
  regular priest
  catholic priest
  paladin dragon nest
  druid healing
  friar
  priestess
  shadow priest
  disc priest
  paladin healing
  druid wotlk
  death knight
  bishop
  discipline
  serrano
  father

Your alternative for priest is not listed? Suggest!
Speaking about priest, one probably shouldn't forget about parish.

Other search terms related to priest and their ratings are:
★★★★★ parish
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Google Trends

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