From the national or regional distribution of religion resulting from the post-Reformation settlement (cujus regio, ejus religio) Europe has followed a formally very diverse (from the violent separation of Church and State in France to a smoother evolution of traditional institutions in England or Germany) but steady course of secularisation ever since the Enlightenment. America has built its own type of "secularisation" on the "freedom" of religious and sectarian communities under a unifying discourse of rational Deism, which rather recently turned into transconfessional Theism...
This was interesting.
The bottom line is that, here, religion is really a private matter and people are not expected to pose as "believers" in public space. In such a context a strong religious commitment is rather the exception than the rule, requiring genuine conviction, and the high level of atheism and agnosticism simply reflects the majority's lack of such conviction in the absence of social constraint. Weren't people expected to declare themselves "believers" in America it would not be so different, I suppose.
I really like this comment, especially the last part. Expectations and appearances: are we really a bunch of codependant hypocrites?