Gallop State of the State poll results for 2011:

Gallup classifies 40% of Americans nationwide as very religious -- based on their statement that religion is an important part of their daily life and that they attend religious services every week or almost every week. Another 32% of Americans are nonreligious, based on their statement that religion is not an important part of their daily life and that they seldom or never attend religious services. The remaining 28% of Americans are moderately religious, because they say religion is important but that they do not attend services regularly or because they say religion is not important but still attend services.

The 2008 Gallop State of the States poll found that 65% of Americans identified as very religious.