Open theism suffers from a fundamental internal tension. A tension between its theology and its methodology. On the one hand, the theology of open theism is basically a variant of Arminianism and Anabaptism. It stresses God's universal love, including God's nonviolent love for his enemies. It stresses the Cross and the Sermon on the Mount as its interpretive prism.
On the other hand, its major prooftexts, in challenging classical theism, are taken from the OT. Narrative theology and prophetic literature. Yet the OT depiction of God's character often clashes with open theist sentiments. If anything, the OT depiction of God's character is frequently the polar opposite of universal love or nonviolent love for God's enemies.