RT Article T1 Evaluating the Theistic Implications of the Kantian Moral Argument that Postulating God is Essential to Moral Rationality JF Studies in Christian ethics VO 34 IS 2 SP 143 OP 157 A1 Breitenbach, Zachary LA English PB Sage YR 2021 UL https://www.ixtheo.de/Record/1755888538 AB I contend that Kant’s moral argument that postulates God and an afterlife in order to justify moral rationality counts strongly in favor of theistic ethics even though it cannot on its own justify that God exists. In moving toward this conclusion, I assess Kant’s moral argument and note how both Kant and the utilitarian Henry Sidgwick, in their own ways, recognize that morality cannot reasonably be seen as completely overriding if God and an afterlife are rejected. I then critique a theistic moral rationality argument offered by C. Stephen Layman, as a flaw in this argument helps to reveal why arguments centering upon moral rationality likely cannot reach an ontological conclusion concerning theism; nevertheless, I contend that moral rationality arguments like Kant’s have apologetic significance for theism. They reveal a dilemma for secular ethics: either appeal to the possibility of theism in order to justify moral rationality or else accept that morality is not fully rational. K1 moral rationality K1 Moral Argument K1 Layman K1 Sidgwick K1 Kant K1 Ethics K1 Apologetics DO 10.1177/0953946820962408