Religious beliefs are part of who a person is. It's not nearly so easy as you claim to remove what you believe from who you are and how you behave. It's clear that a great number of those who traveled to and settled in the colonies and the eventual new nation did in fact come because of the strongly and obviously held religious opportunities. Those feelings permeate everything about this nation from it's founding to it's governance. No, that doesn't mean everyone believes the same things. It does mean that the religious beliefs are strong and serve as foundations for the traditions, beliefs, actions and laws that have followed. Even if you are not a person of faith those who are have clearly affected you and your life, just as you affect those of faith.
I have read numerous opinions of those who say America is not founded on religious belief or principles. Many of those reference Thomas Jefferson as not being a man influenced by this religious fervor. Yet that is not true at all. Jefferson stated that the teachings of Jesus strongly influenced him.
"Although he was critical of established religion, Jefferson makes frequent reference to his belief in the One Creator. It is clear that he held a firm belief in God, even if this God was not in the traditional image of God. Jefferson also believed that Jesus Christ was one of the greatest moral philosophers. Jefferson actually went so far as to create his own version of the Bible, which just consisted of the actual words of Jesus Christ."
He says of the
The Jefferson Bible:
Religious views of Jefferson. View on Christianity, unitarianism, The Jefferson Bible. His views o n the separation of Church and State.
www.biographyonline.net