Did Christianity Create Secularism?

I haven't read Charles Taylor's big new book, "A Secular Age," but I want to. There's an interesting discussion of it over at a blog devoted entirely to the book, "The Immanent Frame," Robert Bellah makes the following point:

Taylor argues that the Reformationwith its radical rejection of the monastic life and the demand of a kind of monastic discipline for everyoneis just the preliminary culmination of a thousand years of pressure of Christianity toward Reform. He then shows how, even when Protestantism itself comes in question, long-term pressure toward Reform continues, first in 18th-century Deism and its attendant strong emphasis on Benevolence, and then in the 19th-century emergence of unqualified (secular) humanism with its emphasis on progress.

According to Taylor, it is not “science” or “Darwinism” that accounts for these developments, but the continuation of a moral narrative that was already long present in Christianity. Even the emergence in the late 19th century of anti-humanism (Nietzsche) cannot be understood except in terms of the particular features of what was being rejected: namely, both Christian and secular social ameliorism. By seeing the emergence of the secular age in narrative form primarily, rather than as a theoretical discovery, I think he makes the whole thing far more intelligible and explains our present quandaries far better than any competing accounts.