All 3 Uses

evangelist
in
Things Fall Apart
(Edited)

They had built their church there, won a handful of converts and were already sending evangelists to the surrounding towns and villages.
p. 143.2 *

evangelists = Christians who try to convince others to become Christian
The Ibo evangelists consulted among themselves and decided that the man probably meant bicycle.
p. 145.7
It was one of those gay and rollicking tunes of evangelism which had the power of plucking at silent and dusty chords in the heart of an Ibo man.
p. 146.6

evangelism = the activity of trying to convince people to become Christians

Definitions:

(1) (evangelist)
someone who actively tries to persuade others to accept a belief or cause, especially a Christian preacher who urges people to become Christians

Most often, evangelist refers to a Christian who preaches and tries to win converts, sometimes on television, radio, or at large revival meetings. More broadly, the word can be used for anyone who strongly promotes an idea, product, or cause—such as a “climate evangelist” or a “tech evangelist.” When capitalized as Evangelist in Christian writing, it can also refer to one of the traditional authors of the four Gospels in the New Testament: Matthew, Mark, Luke, and John.
(2) (meaning too rare to warrant focus)