JI don't think it's useful to say anything is definitely this or that. It may be useful in certain circumstances to think and talk as if the earth is flat, as on a map for example. Or as if it is a sphere, as with a globe. But in reality it may be neither, and we may never pin down with clumsy language definitively what it "is" as in the final say.
You are drifting heavily from the topic of ethics I notice.
I have read The End of Faith and Letter to a Christian Nation. I gather he uses his ostensible anti-religion stance to argue for a militant response to extremist Muslims, wears the American flag on his sleeve, and weirdly ends up endorsing a sort of Buddhism. Not exactly my cup of tea, on many fonts. He is right and everone else is wrong, dangerously wrong if they don't accept his portrayal of the dangers of faith.