"OUR civilization developed as a Catholic civilization. It developed and matured as a Catholic thing. With the loss of the Faith it will slip back not only into Paganism, but into barbarism with the accompaniments of Paganism, and especially the institution of slavery. It will find gods to worship, but they will be evil gods as were those of the older savage Paganism before it began its advance towards Catholicism. The road downhill is the same as the road up the hill. It is the same road, but to go down back into the marshes again is a very different thing from coming up from the marshes into pure air. All things return to their origin. A living organic being, whether a human body or a whole state of society, turns at last into its original elements if life be not maintained in it. But in that process of return there is a phase of corruption which is very unpleasant. That phase the modern world outside the Catholic Church has arrived at."
~Hilaire Belloc: The New Paganism
See the complete essay here.