C.S. Lewis, Plainly, On the Church

People already knew about God in a vague way.  Then came a man who claimed to be God; and yet He was not the sort of man you could dismiss as a lunatic.  He made them believe Him.  They met Him again after they had seen Him killed.  And then, after they had been formed into a little society or community, they found God somehow inside them as well: directing them, making them able to do things they could not do before.

            C.S. Lewis | Mere Christianity