The Collaborative International Dictionary of English v.0.48:
evangelism \e*van"gel*ism\ ([-e]*v[a^]n"j[e^]l*[i^]z'm), n. The preaching or promulgation of the gospel. --Bacon. [1913 Webster]WordNet (r) 3.0 (2006):
evangelism n 1: zealous preaching and advocacy of the gospel