Learn how to say Evangelising correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word evangelize:
convert or seek to convert (someone) to Christianity:
some small groups have been evangelized by Protestant missionaries
[no object] preach the gospel:
the Church has a mission to evangelize and declare the faith
late Middle English: from ecclesiastical Latin evangelizare, from Greek euangelizesthai, from euangelos (see evangel)