What an idiotic lawsuit. The government has many official recognitions of God, such as on our money. They chose perhaps the one instance where the phrase is unofficial and traditional, rather than codified in law. That turns the lawsuit from "the government cannot promote God" to "no government official can personally recognize God in public," which is just stupid.
Most of the efforts to remove official references to God are started by people with way too much time and way too little to actually worry about, but they at least have the advantage that their opposition has no legal leg to stand on. This one runs afoul of the Constitution on two counts. It's almost (that almost is important, though) enough to make me wonder if some religious group isn't behind this.