J. L. Schellenberg articulates and defends a simple but revolutionary idea: we are still at a very early stage in the possible history of intelligent life on our planet, and should frame our religious attitudes accordingly. Humans have begun to adapt to a deep past--one measured in billions of years, not thousands. But we have not really noticed how thin is the sliver of past time in which all of our religious life is contained. And the eons that may yet see intelligent life have hardly started to come into focus. When these things are internalized, our whole picture of religion may...