Quote Originally Posted by zimabog
y
it was simply put there on order by a religious president to:
Wrong, it was put there as part of a joint resolution of the 84th Congress to certify "In God We Trust" as our national motto. That resolution, P.L. 84-140, was signed by the President on July 30, 1956.

Go back to before paper money though and "In God We Trust" has appeared on coinage, more specifically the 2cent coin, since 1864.