"In God we Trust " has been on US Coinage since the civil war. It didn't appear on paper money until 1956, however that has nothing to do with the currency being fixed to a metal standard. The US went away from the gold standard in 1971, well after the motto appeared on paper currency. The motto's appearance on paper currency was simply an extension of an 1834 federal law requiring the phrase on US coinage.

The ruling is disturbing on many levels, but is likely to be thrown out about 30 seconds after getting to a real court.