Learn some history:
"Believing with you that religion is a matter which lies solely between Man & his God, that he owes account to none other for his faith or his worship, that the legitimate powers of government reach actions only, & not opinions, I contemplate with sovereign reverence that act of the whole American people which delcared that their legislature should “make no law respecting an establishment of religion, or prohibiting the free exercise thereof,” thus building a wall of separation between Church & State. " Thomas Jefferson, Jan. 1, 1802
“No religious Test shall ever be required as a qualification to any Office or public Trust under the United States” (U. S. Constitution, 1787, Art. 6, Sec. 3).
“The government of the United States of America is not in any sense founded on the Christian Religion” (John Adams, 1797, Hunter Miller, ed., Treaties and other International Acts, 2:365).
“The appropriation of funds of the United States for the use and support of religious societies, [is] contrary to the article of the Constitution which declares that ‘Congress shall make no law respecting a religious establishment’” (James Madison, February 27, 1811, Writings, 8:133).
“The divorce between Church and State ought to be absolute. It ought to be so absolute that no Church property anywhere, in any state, or in the nation, should be exempt from equal taxation; for if you exempt the property of any church organization, to that extent you impose a tax upon the whole community” (James A. Garfield, 1874, Congressional Record, 2: 5384).
“Leave the matter of religion to the family, the altar, the church, and the private school, supported entirely by private contributions. Keep the church and state forever separate” (Ulysses S. Grant, 1875, Leo Pfeffer, Church, State, and Freedom, 1967, p. 337).
The Constitution of the United States does not contain the words “God,” “Jesus,” “Christ,” “Christianity,” or “Bible.” It makes exactly two references to religion–one prohibiting religious tests for officeholders, and one prohibiting the government from allowing an establishment of religion.
“Experience witnesseth that ecclesiastical establishments, instead of maintaining the purity and efficacy of religion, have had a contrary operation. During almost fifteen centuries has the legal establishment of Christianity been on trial. What have been its fruits? More or less in all places, pride and indolence in the clergy, ignorance and servility in the laity, in both, superstition, bigotry and persecution” (James Madison, Papers, 8:301).
“It is between fifty and sixty years since I read [the Book of Revelation], and I then considered it as merely the ravings of a maniac, no more worthy nor capable of
explanation than the incoherences of our own nightly dreams… I cannot so far respect [the extravagances of the composition] as to consider them as an allegorical narrative of events, past or subsequent. There is
not coherence enough in them to countenance any suite of rational ideas… What has no meaning admits no xplanation… I do not consider them as revelations of the Supreme being, whom I would not so far blaspheme as to impute to Him a pretension of revelation, couched at
the same time in terms which, He would know, were never to be understood by those to whom they were addressed.” --Thomas Jefferson to Alexander Smyth, 1825.