Although I've only read the first one, I do trust the reputations of all the other authors. They all have enough understanding of RW/fundamentalist theology to be able to speak to people who buy into it. If possible, I'd recommend TWO books, the first and second, if he'll agree to it. I list them in order of which ones would probably be most effective to the less likely to be effective, and the quoted portions are from reviewers:
STRENGTH TO LOVE
by Martin Luther King, Jr.
"King's own vision of Christianity is bold and revolutionary. And this vision is firmly grounded in the person of Jesus, whom he describes as "the world's most dedicated nonconformist." While strongly Christian, King is nonetheless respectful of the truths found in other religious traditions...King's radicalism, his willingness to critique the failings of the Christian world, and his rejection of a rigidly fundamentalist style of Christianity have made him a target of ugly criticism from some more conservative Christians...Until you read this book you will not understand the spitirual dynamics of the civil rights movement. I guarantee that the chapter on tough minds/tender hearts will change anyone who reads it. This text MUST become required reading for everyone. Dr. King teaches that it truly takes strength to love. He also explains that God does not leave it all up to us to do but he will give us the strength to love if we submit to his will. He explains as it does in the Holy Bible that anyone can love and do good to those who do good to them but it truly takes strength to love your enemy. In the non-violent revolution Dr. King demonstrates how love(Truth) will always defeat hate(UnTruth). Truth crushed to the earth will always RISE."
http://www.amazon.com/exec/obidos/tg/detail/-/0800614410/qid=1084136132/sr=8-1/ref=pd_ka_1/103-1840886-5675020?v=glance&s=books&n=507846MUSTARD SEED VS. McWORLD: Reinventing Life and Faith for the Future
by Tom Sine
"Sine's book would surely ruffle the feathers of the average church-going, capitalist-loving, suburban Christian. After all, this guy (Sine) has the audacity to claim that we, as Christians, are actually supposed to place the teachings of Jesus on a higher level than the priorities of an American culture based on consumerism. Sheesh!!! Who does he think he is? Sine's emphasis is on re-organizing our lives to get away from the perceived need to mold them in a way that feeds off of materialism, and to focus our efforts instead on the work of God's kingdom. Rather than having our priorities be: material things, family, God; Sine rightly states they should be: God, family, material necessities."
http://www.amazon.com/exec/obidos/tg/detail/-/0801090881/qid=1084136398/sr=1-3/ref=sr_1_3/103-1840886-5675020?v=glance&s=booksTHE SOUL OF POLITICS: A Practical and Prophetic Vision for Change
by Jim Wallis (see www.sojo.net)
"Wallis, a Washington, D.C.-based grassroots activist who is founding editor of Sojorners and an evangelical Christian preacher, writes in the tradition of Wendell Berry, Michael Lerner, Cornel West and others who have sought to reconnect politics to personal responsibility and the need to rebuild family and community...Wallis understands that being a Christian is not about intolerance to minorities, or unbridled capitalism. Wallis understands Jesus' ministry to the poor and warnings to those in power and with great wealth of the responsibilities they have to 'the least among us.'"
http://www.amazon.com/exec/obidos/tg/detail/-/1565842049/qid=1084135745/sr=1-3/ref=sr_1_3/103-1840886-5675020?v=glance&s=booksCEASE FIRE: Searching for Sanity in America's Culture Wars
by Tom Sine
"Tom has a very simple message- live as the Bible states, not as we want it to state...Cease Fire traces the developments of modernism and enlightenment humanism, showing how American Christianity has been coopted by evangelical dualism and materialism, creating a civil religion that is true idolatry. Of interest in today's world, many in the Religious Right end up pursuing a jihad that puts them much closer to Islamic theology than Christian. Tom has some intriguing tid-bits, like what it means to be truly pro-life- and the conservatives definitely don't have the fix on that. He shows how the development of dispensationalism and pre-millenialism is something rather new in American and Church history, and the dangers talk radio has to Christian theology and our way of life."
http://www.amazon.com/exec/obidos/tg/detail/-/0802843344/qid=1084136398/sr=1-5/ref=sr_1_5/103-1840886-5675020?v=glance&s=booksTHE UPSIDE-DOWN KINGDOM
by Donald B. Kraybill
"This book is a much needed wake-up call for evangelicals to stop ignoring radical call of Christ to meet the social needs of people just because the "Social Gospel" has historically been associated with "liberals". Through an insightful and culturally/historically/scripturally contextualized look at the synoptic gospels (and especially Luke)Kraybill shows that Jesus' message of hope for the poor and oppressed is more than merely spiritual. Too often Christians try to spiritualize away the gospel passages where Christ seems to be calling us to a radical way of handling our resources and power when dealing with those with less money or lower social position. Kraybill goes beyond just calling us to help people however; he shows us that concern for the poor, the oppressed and the alien is essential to true spirituality and the gospel. Working towards the realization of the Kingdom of God requires that we try to liberate people from both spiritual and social oppression. In fact the two are quite often the same thing."
http://www.amazon.com/exec/obidos/ASIN/0836192362/ref=pd_sxp_elt_l1/103-1840886-5675020You might be able to preview these first at your local library. And even if your dad only reads one, I think you'd like them all.
Good luck and let us hear what happens!