What are the motifs in The Dark Tower: The Gunslinger by Stephen King?

Religion comes into play many times within this book. Religion does not equal spirituality or enlightenment. While the gunslinger seems to be atheistic in manner and personality, he goes to the church in Tull and obviously believes in God. He speaks of God to the man in black as an entity he knows exists. The man in black, a sorcerer, is mistaken as a "priest" by the people of Tull and by the boy Jake.