Skeptics and True Believers by Chet Raymo

Picked this up for a few $$$ at the used book store. Usual stuff about folks who accept science (yea!) rather than remain dogmatically ignorant in religion (boo!). You should be able to find it on the shelf at your local Strawmen'R'Us.

God's Battalions by Rodney Stark

Subtitled the Case for the Crusades.