As an admirer of Sagan, very much liked reading this magnificent book compiled by Ann Druyan from Sagan's transcribed talks on natural theology delivered in 1985 at the University of Glasgow as part of the Gifford Lectures.
Like Einstein, Sagan had said that he believes in Spinoza's God which reveals itself in the lawful harmony of the nature, the world, indeed the universe, not in a God who concerns itself with the faith and the doings of human beings. So do I...
God is the energy we are made of, like all in the universe. God is that single particle of atom of quarks which started to create the ever expanding universe with the big bang. As Einstein said, God is the total sum of all the laws of physics (and nature) which applies throughout the universe. God is the science, the key to everything...