evangelist

noun6

1. •
   An itinerant or special preacher, especially a revivalist, who conducts services in different cities or locations, now often televised.
2. •
   A person who first brought the gospel to a city or region.
3. •
   A person marked by extreme enthusiasm for or support of any cause, particularly with regard to religion.

   • Booth, William (1829-1912) English evangelist; founder and first general of the Salvation Army ... his subordinates being expected to give him unquestioning obedience. — 1992
4. •
   A person hired to promote a particular technology.

   • […] and has worked in multiple roles, including as the C# Product Manager and as a Developer Evangelist in the Mid-Atlantic district. — 2007
5. •
   A writer of a gospel, especially the four New Testament Gospels (Matthew, Mark, Luke, and John), usually capitalized (Evangelist).
6. •
   A patriarch.

noun1

1. •
   A writer of a gospel, especially the four New Testament Gospels (Matthew, Mark, Luke, and John), (also evangelist.)