There is no paramount greater than the proclamation of the Gospel followed next by the command of Christ to make a disciple of them. But after a man is rescued from his sins and becomes a follower of Jesus Christ, what then? - - He is then taught the Bible and then instructed to put his or her faith into practice – This is Christianity.
And in so doing - the world that surrounds that believer - will be influenced by the life, conduct and witness of that believer. This truth is so powerful that one man or woman can change the course history; and the Bible is full of examples of that very thing.