erm in a very interested book called darwin on man recently by a psychologist called gruber, gruber has argued that darwin had a conviction which could be expressed by saying that things which are natural are necessarily gradual, and things which are sudden are miraculous and not natural, that he had this equation in his mind erm long before he erm became and evolutionist, long before he abandoned his belief in religion which he largely did later, and gruber traces it back, interestingly enough, to the arguments of a theologian, sumner, who later became an archbishop, who  darwin took notes on his ideas when he was a student at cambridge erm which are still extent, and what sumner had argued, among other things, was that a good argument for believing in the divinity of christ, that christ was divine rather than simply being a gifted teacher, was the suddenness with which the beliefs of the ancient world were transformed by christ's teaching.