Torcaso v. Watkins, 367 U.S. 488 (1961) was a United States Supreme Court case in which the court reaffirmed that the United States Constitution prohibits States and the Federal Government from requiring any kind of religious test for public office, in the specific case, as a notary public.
Read more about Torcaso V. Watkins: Background, The Court's Decision, "Secular Humanism" As Religion