Americans are losing their religions

A new study is confirming what we have been expecting. Americans of this generation are far less religious than those of past generations. Of most interest to me was the fact that the change does not appear to be specific to region or ethnic group, and even unassimilated immigrants are tracking with the trend. Does this mean that we are headed toward purely secular societies like Europe, or is it a sign that the poll is too tied to older religion designations and is ignoring new movements like the "Emerging Church"?