Adam Miller, author of Badiou, Marion, and Saint Paul: Immanent Grace, has been developing an account of grace within the framework of Badiou and Jean-Luc Marion. More recently he has been situating his account in terms of some of my own work and the work of Latour. One of the things I find particularly interesting about his project is that he argues that this account of grace holds regardless of whether one holds a theistic conception of God and even if one is an atheist. Read more over at The Church and Postmodern Culture here, here, here, and here.