There is no abstract noun for the proper noun 'Baptist, a word for a person. The word 'Baptist' also functions as an adjective, which is used to describe many abstract nouns; for example, Baptist beliefs, Baptist religion, Baptist doctrine, etc.
There is a St. John the Baptist but no St. John Paul the Baptist.
John the Baptist was never married.
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John the baptist then they are cousins.
John Baptist Walsh died in 1825.
John Baptist Hogan was born in 1829.
John Baptist Grano was born in 1692.
John Baptist Grano died in 1748.
John Evans - Baptist - was born in 1767.
John Evans - Baptist - died in 1827.
John Baptist Butt died in 1899.