The only acknowledgment of religion in the original Constitution is a utilitarian one: the document is dated “in the year of our Lord 1787.” Even the religion clause of the First Amendment is framed dryly and without reference to any particular faith. The Connecticut ratifying convention debated rewriting the preamble to take note of God’s authority, but the effort failed.
From
A Nation of Christians Is Not a Christian Nation – New York Times
Must read article on the Freedom from Religion that is an absolute necessity to protect Freedom of Religion.