C.S. Lewis
C.S. Lewis (1898-1963) was an agnostic professor at Oxford and Cambridge who converted to become a Catholic. He credits J.R.R. Tolkien, the author of the "Lord of the Rings," which converting him.
C.S. Lewis wrote The Chronicles of Narnia, The Screwtape Letters, Miracles, The Problem of Pain and the Abolition of Man. Over 200 million copies of his books have sold and they continue to sell at a million copies a year.
C.S. Lewis wrote "In Mere Christianity," "All that we call human history - money, poverty, ambition, war, prostitution, classes, empires, slavery - is the long terrible story of man trying to find something other than God which will make him happy."
C.S. Lewis also said, "Christianity ... is a religion you could not have guessed ... It is not the sort of thing anyone would have made up."