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The Constitution of These United States guarantees the freedom of religious expression in the 1st Amendment. Religious expression is listed prior to freedom of speech or the press or assembly.
"[i]Amendment I - Freedom of Religion, Press, Expression. Ratified 12/15/1791.

Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.[/i]"

The other mention of religion in The Constitution of These United States is in Article 6:

Article 6 - Debts, Supremacy, Oaths

All Debts contracted and Engagements entered into, before the Adoption of this Constitution, shall be as valid against the United States under this Constitution, as under the Confederation.

This Constitution, and the Laws of the United States which shall be made in Pursuance thereof; and all Treaties made, or which shall be made, under the Authority of the United States, shall be the supreme Law of the Land; and the Judges in every State shall be bound thereby, any Thing in the Constitution or Laws of any State to the Contrary notwithstanding.

[i]The Senators and Representatives before mentioned, and the Members of the several State Legislatures, and all executive and judicial Officers, both of the United States and of the several States, shall be bound by Oath or Affirmation, to support this Constitution;[b] but no religious Test shall ever be required as a Qualification to any Office or public Trust under the United States.[/b][/i]

All it says is that there will be no "official" state religion, like the Church of England or the Catholic Church that dominated europe at the time. And no person will have to belong to any specific church to own land, hold office, vote or be a citizen.
Any other reading is expressly contra-Constitutional and if those of us that have sworn to uphold that Constitution, "against all enemies, foreign or domestic" would honor those oaths, then those attempting to force a state religion of atheism would be placed under the dirt where they've so long belonged.