The Gospel is asinine fatuity!

C.S. Lewis' book Mere Christianity is written in very accessible language and easy to read. But, there are a few instances, where he slips into language more characteristic of an Oxbridge don. One example (from the end of the chapter, The shocking alternative) is:

But what should we make of a man, Himself unrobbed and untrodden on, who announced that he forgave you for treading on other men's toes and stealing other men's money? Asinine fatuity is the kindest description we should give of his conduct. Yet this is what Jesus did. He told people that their sins were forgiven, and never waited to consult all the other people whom their sins had undoubtedly injured. He unhesitatingly behaved as if He was the party chiefly concerned, the person chiefly offended in all offences. This makes sense only if He really was the God whose laws are broken and whose love is wounded in every sin. In the mouth of any speaker who is not God, these words would imply what I can only regard as a silliness and conceit unrivalled by any other character in history.