It is in there. Maybe they just considered that as understood?
They all loved God. That is evident in many places other than the Constitution. But it is there too, notable by its absence.
In other words, that’s exactly why it is so remarkable and laudable that they kept Him out of the document: They knew you had to decide for yourself if you were one of God’s people, and if you put it in the law you are fouling the whole batch. Seems like such a minor—and even controversial—point to some, but it is the backbone of our nation. We love God but do not in any way coerce others to honor Him. We give them the priceless gift of their own conscience in the matter.
They were Protestants, remember. The Catholic Church didn’t get around to dealing rigorously with the issue of conscience until the first years of Vatican II (most of the things in Vatican II that Catholics object to came with the next pope, not John XXIII). The Baptists, with their concept of baptism by personal commitment, have been called the heirs of the Puritans. And they were the heirs of 18th-century enlightenment, and so are we.
Thank you, Lord, for the razor-sharp minds of our founders.