I think theologian Greg Boyd contributes to the discussion on free will in a very real way. Some other interesting aspects of this anti violence vegetarian:
His book on imaginative prayer: Seeing is believing
His book on spiritual mindfulness: Present perfect
Spiritual warfare is real
Violence is always wrong
His podcasts has been a huge inspiration for me; I encourage anyone tired of the evangelical Christian right (but still interested in practical spirituality) to dig into his teachings.