They Assert that Since There are No Valid Religions, the Task of Smart People is to Create a Religion Without God
Kitcher is here saying the kind of things that we have recently heard from Alain de Botton and Ronald Dworkin. His argument is that since religion does a good job in promoting values, it should not be abandoned; instead, it should be "refined," eliminating fundamentalist doctrines and transcendent facets of reality. What will remain is "soft atheism," a system of advancing enduring values without the need for a belief in God, redemptive elements, or any of the mysteries that religion promotes.
Philosophers have made such proposals before, of course, but what they all have in common is that they do not work. Philosophy can do many things, but it cannot create deep loyalty, profound engagement, or a willingness to sacrifice for one's beliefs. Religion, whether of the liberal or orthodox variety, does precisely that.