there is really no evidence of this, at least in the US. in fact the US today is much more religious today than it was 50 years ago. its certainly much more religious than in Europe.
sorry there is abig difference between pretending to be religious and being religious.
And yes, i come form europe, so i can testify christianity has died there and that a mixed bag of islamic sub culture and african beliefs are taking over as the new religion with the help of leftists main strem medias and politics who widely opened the borders to the flood of muslims and blacks from africa and middle east.
But again, wether it's in europe or north america, just because people pretend to be either christians, or muslims, they re all a bunch of confused atheists in need of mind discipline and values they re trying to build from a patchwork of beliefs.
Nowadays anyone can get as much as he wants from every philosophies or religious ideologies ever created browsing the web or reading books and i think most people are a bit Atheists, and christian and/or muslims, buddhists etc, while watching TV 24/7 and being materialistic / capitalistic individuals at the same time.
We re all mixing everything we see and hear on a daily basis to shape a new kind of global , international new kind of religion, and that's why someone like obama has been elected in the USA.
The world is building itself a new world order, a new religion. It's hapening right now and we're all part of the process in this interconected global world.