Yep, I know that was added to paper currency in 1957 and adopted as an official motto at that time. It was used previously, but intermittently, on coins, since 1864. It definitely does not have roots in our country's founding, but was a response to increased religiousness in the 1860s during the Civil War. That's a hard argument to make if you are basing it on our founding fathers, the principles under which our country was founded, and the constitution.