I have had this discussion with an old attorney friend from work. He studied to be a Catholic Priest for a while...but liked women too much. :) He identifies as Catholic but rarely attends church. Calls himself "Spiritual but not religious".
3#rd Gen and I moved to rural northern California 25 years ago from the San Francisco Bay Area. We have a LOT of former Assembly of God Pentecostals who have moved into our town. They (Bethel church) now comprise about 15% of the population. They have added some Hippie- Hindu practices (Kundalini tantric sex), "Prosperity gospel", NAR beliefs and rock music to their religion and seem to be growing. Combined with speaking in tongues, faith healing, and far-right political bent they are very different. They believe god will protect them from illness, yet have a militia.
I read that most Americans are becoming less religious.."Spiritual"....but not religious.
New York Times : America Is Losing Religious Faith