Finally, because there is no single uncontested way to understand the boundaries between philosophy and theology, it is open to Christian philosophers of religion simply to deny the sharp distinction presupposed by critics like Schellenberg and Simmons (see, for example, Plantinga 1984, Wolterstorff 2009). In so doing, they would implicitly endorse a more Patristic “Integration” model instead of either the Medieval “Cooperation” model or the modern “Disjunction” model (see Section 2 above).