Importance of religion by country
http://en.wikipedia.org/wiki/Importance_of_religion_by_country
Eurobarometer Poll 2010
http://en.wikipedia.org/wiki/Religion_in_Europe
The 2010 Eurobarometer Poll asked whether the person believed "there is a God", believed "there is some sort of spirit of life force", or "didn't believe there is any sort of spirit, God or life force".
Church attendance
http://en.wikipedia.org/wiki/Church_attendance