After brief explanations of constructive postmodern science and its epistemology, and the most widely accepted cosmological theory, the Big Bang, this essay explores their potential for theological reflection on the Christian God of creation. Attention is given to the Christian doctrine creatio ex nihilo; concordism of it with the Big Bang is ruled out. The potential for consonance of postmodern Big Bang cosmology with the Christian God of creation is examined. In a revisionist move, an abstract, unipersonal theism is rejected as not true to Christian trinitarian revelation and therefore inappropriate for an exploration of consonance with Big Bang cosmology. Consonance of major elements of cosmic process, made intelligible by postmodern cosmology, with the exocentric Trinity “immanent to the world” is proposed.