You mean a Protestant? We already have a word for that. MLK took care of that for everyone.
I think you might be confusing Martin Luther, a priest who lived in what is now Germany in the 15th century and started the Protestant Reformation, with Martin Luther King, Jr., a Baptist minister who played an influential role in the American civil rights movement in the 20th century.
I think you might be confusing Martin Luther, a priest who lived in what is now Germany in the 15th century and started the Protestant Reformation, with Martin Luther King, Jr., a Baptist minister who played an influential role in the American civil rights movement in the 20th century.