This long and sometimes involved book may be regarded as a sustained attempt to investigate the existence of God. If – as seems likely – God does not exist in any straightforward way, it attempts to find some place for religion in a world that shows absolutely no traces of his existing. (There are, of course, for good or for ill, numerous traces of people's believing in God, but God's existence cannot without circularity be reduced to the effects of people's believing that he exists, though this ploy is sometimes attempted.)