I'm sure his audience was Christian. One thing he did teach was unity within the body of Christ, so it doesn't actually include non-believers. Ergo, it has less to do with the entire world and more about Christiandom.
"There ought to be a term that would designate those who actually follow the teachings of Jesus, since the word 'Christian' has been largely divorced from those teachings, and so polluted by fundamentalists that it has come to connote their polar opposite: intolerance, vindictive hatred, and bigotry." -- Philip Stater, Huffington Post
always working on cleaning my windows- me regarding Johari
always working on cleaning my windows- me regarding Johari