Points out early on that there has to be biology happening, or there wouldn't be experience. Whether the biology is linked to actual existence of an entity is outside the scope, because James is a Pragmatist and doesn't consider actual existence a real question.

Fun book. The only piece of philosophy I've ever read that shows God existing without making huge (sometimes subtle) errors, but he does it by changing the question. And God (like everything else) only exists conditionally.