You people choose to believe that a significant number of people would lie on the census about believing or not believing in God, because you do not like the answer.
They had the choice to say "no religion" and only a minority selected that.

This YouGov poll asked different questions but showed the same picture.
Only 40% said "not religious at all."
http://cdn.yougov.com/cumulus_uploads/document/xbqfnxhcct/YG-Archive-140423-Religion.pdf