To fulfill the "Great Commission"
Mark 16:15 "Go into all the world and preach "Good News" to everyone, everywhere".
Mathew 28:19 "Therefore, go and make disciples of all nations, baptizing them in the name of the Father and the Son and the Holy Spirit. Teach these new disciples to obey all the commands I have given you. And be sure of this: I am with you always, even to the end of the age.