The cardinal question in Christian moral theory and bioethics is whether the knowledge that Christians have (1) by grace and (2) by revelation (e.g., regarding the character of human and cosmic history as reaching from creation through the Incarnation and the Redemption to the Second Coming and the restoration of all things) makes a crucial contribution to understanding morality, as for example issues such as the good death and the morality of physician-assisted suicide and euthanasia. This article argues that such (...) a contribution is made by grace and revelation. The reduction of Roman Catholic moral theology and bioethics to secular bioethics is explored, as well as the necessity of the unique knowledge possessed by Christians for adequate end-of-life decision-making. (shrink)