As for the founding father beliefs? I'd say it's like most people many as they age become more conservative in their religious beliefs both by reading and through personal experience and soon find out for themselves by revelation through The Holy Spirit the truth.
Churches today in many places are falling or fallen and it's beyond a any one denomination problem many have been affected and many have such within their clergy. The more conservative churches are removing such from their leadership positions. Others of the more liberal sects are chosing them as pastors.
Ones allowing such abandon even the very basic laws and commandments GOD gave. I'm talking about the adoption of policies supporting gay marriages, gay clergy, etc. But the one church I see as doing the most harm to the nation as a whole is the United Church of Christ. Look up separation of church and state and see who heads it and profession. Not to be confused with the far more conservative Church of Christ. As I understand it maybe 3 of the 55 were not actually active members of a church. Then again neither am I.
If anyone is trully seeking and reading the Bible I don't think they could remain a Deist for long. There is but one sin which can not be forgiven a person. Blasphemy of The Holy Spirit which brings the absolute rejection of Jesus Christ. It is a state of ones heart so hardened toward GOD it will not change.
That was meant to be posted about the formers of the U.S. Constitution.
"Fifty two men of the 55 who formed the Constitution were active Christians. Although many of them by today's church standards would be rejected because they were Deist."
"Which ones were not Christians and which ones would not have been allowed in our current Christian churches? You think that current America is more Christian than our founding fathers, and presumably the Americans that they served? "