That is the separation of church and state, which has absolutely nothing to do with the values that America was built on, nor the ethical or civil law that is founded in Judeo-Christian beliefs. This is not something that I am trying to convince anyone of, it is the way our country was founded.
The founding fathers would disagree with you, guess the authors of the following quotes.
“If I could conceive that the general government might ever be so administered as to render the liberty of conscience insecure, I beg you will be persuaded, that no one would be more zealous than myself to establish effectual barriers against the horrors of spiritual tyranny, and every species of religious persecution.”
“We have abundant reason to rejoice that in this Land the light of truth and reason has triumphed over the power of bigotry and superstition… In this enlightened Age and in this Land of equal liberty it is our boast, that a man’s religious tenets will not forfeit the protection of the Laws, nor deprive him of the right of attaining and holding the highest Offices that are known in the United States.”
“The Government of the United States of America is
not in any sense founded on the Christian religion.”
“I contemplate with sovereign reverence that act of the whole American people which declared that their legislature
should make no law respecting an establishment of religion, or prohibit the free exercise thereof, thus building a wall of separation between church and state.”
“And I have no doubt that every new example will succeed, as every past one has done, in shewing that religion & Govt will both exist in greater purity, the less they are mixed together.”
"Christianity is the most perverted system that ever shone on man"
"It is too late in the day for men of sincerity to pretend they believe in the Platonic mysticisms that three are one, and one is three; and yet the one is not three, and the three are not one."
"There is not one redeeming feature in our superstition of Christianity. It has made one half the world fools, and the other half hypocrites."
"In the affairs of the world, men are saved not by faith, but by the lack of it."
"This would be the best of all possible worlds if there were no religion in it"
And some other quotes that I don't even want to repeat, but it's clear that most founding father were devout atheists. This whole myth of them being Christians is made up by the conservatives.