In the interest of full disclosure, i have to admit that i'm a big fan of Garry Wills. i may not always agree with him, and i may not always understand the finest points of his arguments, but i always respect his rigor, his curiousity, his search for truth, and his his integrity.
Even though this is, ostensibly, a single work on god, politics, morality and america, it really reads like thirty-odd essays on these topics, linked together by theme or argument. as such, they can be read sequentially, partially, or individually. anyway that they are read will prove edifying and enlightening - explaining aspects of american political and religious interconnectedness that have often gone unexamined, unexplained or unacknowledged.
I recommend this work to anyone interested in america, american history, american politics, american religion, american culture - or any combination of the above. but be forewarned - it's heavy treading at times and requires a reader as thoughtful and engaged as wills was when he wrote it.