Here is a funny story about atheistic propagandists.

Addendum: Here is the definition of "propagandist" from the Oxford English Dictionary, 2d ed.:

propagandist, n. (a.)

A. n.

1. A member or agent of a propaganda; one who devotes himself to the propagation of some creed or doctrine; a proselytizer.

2. spec. A missionary or convert of the Roman Catholic Congregation of the Propaganda.

B. adj. Given or inclined to propagandism; devoted to the propagation of doctrines or principles.

Hence propagan'distic a., of or pertaining to propagandists or propagandism; propagan'distically adv., in a propagandist manner.