All religions have not had a cultural or historical impact on the concept, creation, and evolvement of the United States as a nation or the language, arts, music, sculpture, architecture, laws, customs, traditions that we share as a people. To include all in the historical record would not only be really REALLY bad history but would be too silly to even consider.
Again nobody is suggesting that JudeoChristian doctrine or dogma be taught in the public schools but rather the profound degree that JudeoChristian influences have driven our laws, culture, customs, traditions, history.