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St. John Neumann was a Catholic bishop.
John Toner - bishop - died in 1949.
John Milner - bishop - died on 1826-04-19.
Yes, the word "bishop" should be capitalized when referring to a specific person's title or role in the context of a church or religion, such as "Bishop John." If used more generically or descriptively, it does not need to be capitalized, as in "The bishop led the service."
John Bishop was born on November 30, 1966.
Bishop John Wynn goes by John Wynn.
John Bishop Estlin died in 1855.
John Bishop Estlin was born in 1785.
John Bishop Putnam was born in 1849.
John Bishop Putnam died in 1915.
John Chambers - bishop - died in 1556.
John Gray - bishop - was born in 1817.