Fascinating old article. In my opinion, the following quote is particular relevant in light of the recent Pew Research Center Survey of U.S. Jews:

To my mind the conception of Reformed Judaism is in itself a contradiction. It arises out of great confusion between two ideas—religion and religiosity. Many people who are not connected with any definite religion are yet religious by nature. We may say of them that they possess religiosity although not religion. But a great community embracing a large number of members can be based only on a religion which in its turn is based on a belief in Revelation, in divine authority. That alone can keep a great religious community together for many generations. There is no instance in history of a great religious community being based only on religiosity of the individual, without the aid of divine authority by way of supernatural revelation. There were many attempts in the eighteenth and nineteenth centuries to create such communities on the basis of so-called natural religion, Theism, even Positivism, but they all practically failed. This is inevitable, because they are necessarily dependent upon individual sentiment and individual judgment. A real religion capable of holding together a large community from generation to generation must have its basis and cohesive power in the general belief that this particular religion embodies the true word of God revealed by Himself at a certain time and transmitted by tradition to all future generations. This granted, there can be no religious reform in the sense of arbitrary eclecticism, because reform of that description is the negation of Revelation. The true word of God cannot be arbitrarily altered.