The paper deals with the notion of ceremonial deism, as it is understood in U.S. case law and jurisprudence. This term describes on kind of the government’s acts of symbolic references to God or religion, for example words „under God” in Pledge of Allegiance or the national motto – „In God We Trust”. American courts hold that particular forms of ceremonial deism are in accordance with the Establishment Clause due to their lack of a religious meaning (secularization thesis), nonsectarian nature, secular aims, historicity, ubiquity and non-controversiality. In the Author’s view, the above mentioned understanding of ceremonial deism is not fully proper. He calls on the rejection of secularization thesis and premise of non-sectarian nature. According to him, the public authorities’ acts of religious references are compliant with the Constitution when they perform significant secular aims, they do not have a devotional character and they constitute a testimony to the history and tradition of a particular country and its citizens. The criteria of ubiquity and non-controversiality may, due to its highly evaluative and subjective character, serve only a supportive role within the verification of the legality of a prima facie religious expression acts of the state. Theory of ceremonial deism, being understood properly, may constitute a valuable tool to evaluate the constitutionality of the public authority’s actions, also outside the United States.