Yes, a theologian or pastor is considered a professional. They have many years of training to do their work.
John Clavin was an infleutial French theologian and pastor during the Protestant Reformation!!!
John Calvin was a French theologian, as well as pastor during the Protestant Reformation.
John Calvin was not a professional historian. He was training to be a lawyer before settling in Geneva. Among other things, He became a Pastor and the magisterial governor of Geneva. He was one of the best (if not the best) theologian the church has ever seen, so he probably had extensive knowledge of church history, although I doubt this would qualify him as a historian.
Very similar to what a male theologian can do.
Yes. There have been many great women who are a theologian.
He doesn't have brothers. He has ten sisters, he is the only son in his family.
Edmund O'Reilly - theologian - died in 1878.
Edmund O'Reilly - theologian - was born in 1811.
John Brown - theologian - died in 1787.
John Brown - theologian - was born in 1722.
John Mill - theologian - died in 1707.
Georg Sverdrup - theologian - died in 1907.