Oh, and you wern't doing that well enough before 1957?
The national motto "In God We Trust" appeared on US Currency as early as 1864. From the article:
The most common place where the motto is observed in daily life is on U.S. currency and coinage. The first United States coin to bear this national motto was the 1864 two-cent piece. It wasn't until 1957 that the motto was permanently adopted for use on U.S. money.