Dear Blue,
I will try to look out for the book, Sam Harris is one of the better celeb atheists ( in my opinion ) probably because he uses words and descriptions I can understand, or maybe that he is not so anti theist as some of the other well known atheists.
Just to add, the idea of a soul is not just a Christian idea, but of course you know that, I think I have a soul, the better part of me, listening to a beautiful piece of music, reading a Kipling poem, getting lost in the mind of Pratchett, this is all touching my soul.
Gonnagle.