@Yaarel hit it nicely. Also far away paladin explores the question a bit but I can't recall if the anime adaptation includes any of that since it ends around book one or two iirc. Bishops are political figures of the church responsible for juggling the sometimes conflicting needs & desires of the church and the easily ruffled feathers of demanding nobles/wealthy merchants/scary adventurers. A bishop may or may not have divine powers and may not even personally live in a way that fits their church's faith if doing so allows them to better perform their job