But the very momentum on which it lost its influence was the result of processes within Christendom as well. The very idea of secularization presupposes distinctly Christian ideas. The religion itself posited the distinction between the secular and sacred spheres, albeit in a difference sense, and secularization/ modernity was in part the process of the gradual withdrawal of human thought and activity into a sphere which was created by the Christian imagination.
The notion of the incarnation, the idea that the divinity took up its residence in human finitude and individuality created the blue print for much of Western thought, even today. We might say that Pentecost came to be seen as the emptying of heaven into earth as the eschatology of Christianity was turned completely immanent.
It remains to be seen, I think, how much of the Enlightenment project has actually been contingent on Christian ideas- and in turn, how much Christianity must recognize its achievements as its legitimate child.