I'll post the following article from Forbe (2012) that has yet to be torn apart or refuted by any group to date:

Was America Founded As A Christian Nation? - Forbes

Regardless of your religious upbringing (some are staunch in their beliefs, based on their upbringing, others can sit back and read this with an open mind, regardless of their upbringing), it's well researched, and well written, and has not been torn apart by any of the religious groups, both conservative or ultra radical.

Bill S.