Kant attempted to work out a view of religion and religious belief according to which existing religions could be brought into harmony with modernity, science and reason.

Kantian ethical theory distinguishes three levels: First, that of a fundamental principle (the categorical imperative, formulated in three main ways in Kant's Groundwork); second, a set of duties, not deduced from but derived from this principle, by way of its interpretation or specification, its application to the general conditions of human life - which Kant does in the Doctrine of virtue, the second main part of the Metaphysics of Morals; and then finally an act of judgment, through which these duties are applied to particular cases.

What is central to morality is rational self-constraint (acting from duty), in cease where there is no other incentive to do your duty except that the moral law commands it.

When consequentialist theories are developed in terms of an equally shallow psychology of the good - such as a crude form of hedonism - the results can sometimes strike sensible people as revolting and inhuman. People can be reduced to simple repositories of positive or negative sensory states, and their humanity is lost sight of entirely.

Many who are committed to reason and science have turned against religion altogether and treat it with fear and contempt.

In my acquaintance with John Rawls, I found him to be a simple and honest man, who just by chance also happened to be the greatest moral philosopher of the twentieth century. I would like to think that I could emulate at least his modesty - his refusal to exaggerate his perception of himself and his place in the larger scheme of things - even if my work never compares with his in its importance.

Popular religion since the time of Kant and Fichte has gone in a direction they tried to prevent and that has been disastrous for the humanity both of believers and of the rest of us. Look at the role of religion in Republican presidential primaries if you need any confirmation of this last statement.