The Founding Fathers knew that without a belief in God, the 'new' American Constitution, would not last. As Americans move further and further away from God, an oath becomes meaningless.
When senators refuse to be 'sworn in' using a Bible, and instead use an NFL rule book, a koran, a sports illustrated, or a roll of toilet paper, the Republic is over.
We patriots that have sworn the oath, will watch the end, we may fight {a bit} but like all other forms of government through out human history, the majority is too {stupid, lazy, complacent, weak, gutless, wimpy, etc...} to again fight a much needed revolution.
The Roman Empire lasted 500 years, the USA, with our original intent and Constitution, will not make 300.
I will be long since dead, but I have little hope for the youth of America, including all of my off spring.
Sad.
Have you ever even read the Constitution?
It doesn't require a Bible. It doesn't even require an oath; it permits an "Oath or Affirmation." (Art. II, sec. 1; Article VI). It also provides that "no religious Test shall ever be required as a Qualification to any Office" (Article VI).
And, by the way, John Quincy Adams took his Presidential oath of office on a law book, not a Bible, to show that his allegiance was to the Law, not to any religious denomination. The Republic seems to have survived nonetheless.