The U.S. Constitution is widely considered a secular document because it deliberately separates government from religious authority, does not mention God or any deity, and explicitly prohibits religious tests for office, reflecting an intention to establish a government where laws and authority are justified with secular, not religious, reasons. [1][2][3]
In summary, the U.S. Constitution is secular by design, intentionally separating government and religion, which the Founders considered a vital safeguard for freedom and pluralism, regardless of their personal faiths.[8][1][7][3]