The details here are important, since many working in evolutionary ethics presuppose a strong kin selection component in our disposition for altruistic behaviour--this despite the fact that, 'long before our last common ancestor with the chimps (about 5 million years ago), all the primates had ceased to live in groups in which kin altruism
would be selected for' (188).
Browning eschews any sort of divine command theory of ethics, substantially rejects the notion of a sacrificial ethic, and insists that a Christian love ethic only makes sense in relation to its purported origins in a primeval "kin altruism
." He does invoke Christian theologians like Reinhold Niebuhr, Paul Ricoeur, and the Roman Catholic Louis Janssens, but offers their various contributions as Christian adumbrations of basic observations of evolutionary psychology.