Really?
"Can the liberties of a nation be sure when we remove their only firm basis, a conviction in the minds of the people, that these liberties are a gift from God? Thomas Jefferson
"Our constitution was made only for a moral and religious people. It is wholly inadequate to the government of any other." John Adams
"You have rights antecedent to all earthly governments; rights that cannot be repealed or restrained by human laws; rights derived from the Great Legislator of the Universe" John Adams - 2nd Pres.
"(T)he foundation of our national policy will be laid in the pure and immutable principles of private morality; ...the propitious smiles of Heaven can never be expected on a nation that disregards the eternal rules of order and right which Heaven itself has ordained..." George Washington, First Inaugural, April 30 1789
What many fail to understand is that the Atlantic Ocean was not replete with ships carrying members of those other religions.
I have been taught that Christianity is part of the law of the land. The four gospels upon the clerk's table admonish me it is so every time they are used in administering oaths. ...What is conclusive with me, that this is all that was intended, is, the punishment inflicted by the act. For willful and malicious murder, the offender is to suffer death without the benefit of clergy — the former punishment. ...
It is well said by one of the judges of North Carolina, that the master has a right to exact the labor of his slave; that far, the rights of the slave are suspended; but this gives the master no right over the life of the slave. I add to this saying of the judge, that law which says thou shalt not kill, protects the slave; and he is within its very letter. Law, reason, Christianity and common humanity, all point out one way.
Justice Jacob Peck, Fields v. The State Of Tennessee, 1 Yerger 156 (1829).