>> up next, "after words" with guest host, sally gwynn. this week, claimed religious author, karen arm strong, and her book hi pi fields of blood. " she argues the formation of religion involves bloodshed. this program is about an hour. >> karen, hi. i'm so glad that you could join us this morning. i have to say i'm stunned that you managed to put out one of these books. seems like every two years. this is one of the most extraordinary scholarshiply things i have seen. i don't know how you do this bus that not story. i want to talk to you about your book because it is -- it's so definitive about violence and religion. but secondly, your thesis is really interesting. which is that religion may not necessarily be the cause of all violence, and i wondered what prompted you to do this book in the first place. >> guest: just abuse i'm a writer about religion, i keep getting told by taxi drivers, psychiatrists, and teachers, that religion has been the cause of all the major wars in history, and it really jars because it's clear the not true. the