I have finished reading Good Without God. I recommend it. It's pretty well written and Epstein has something to offer the conversation about the place of religion in society. I'll put it on the summer reading list for the church. It would make an excellent book to take with you to the beach or the lake or wherever you go in the summer to get away and think about things that you don't usually give yourself time to think about.
The book has convinced me of one thing. Religious institutions and traditions need to get out of the morality business. Of course moral life is important. Of course churches, synagogues, mosques etc will speak to morality. Yes. But they can no longer live as if they are the lone or best authority for any moral claim. What we have is God. What we have is The Divine One. Morality will be part of that inquiry and encounter, but our purpose for being is God and none else.