Freedom OF religion? Or freedom FROM religion? What does the Constitution say? We’ve all read it: “Congress shall make no law respecting an establishment of religion.”
Prohibiting all religious expression in public events is therefore illegal. That includes non-sectarian prayer, the pledge of allegiance, displaying the Ten Commandments, etc. Prohibiting those expressions is just as illegal as it would be to pass a resolution declaring the United States to be a Christian country, or a Muslim country, or a Jewish country. No atheist should be punished for abstaining, and no believer should be prevented from praying.