As the National Day of Prayer nears, a right-winger wrote,
President John Adams declared May 9, 1798 as "a day of solemn humiliation, fasting, and prayer," during which citizens of all faiths were asked to pray "that our country may be protected from all the dangers which threaten it". What could be so wrong with inviting all faiths to pray for our country?
Nothing, so long as Congress doesn’t pass a law about it because such a law would violate the First Ammendment prohibition that it “shall make no law respecting an establishment of religion.” Note that the ammendments says, “of religion” and not “of A regligion” as it protects non-believers as well religions and sects from one another.
Prayer has only a religious and no secular function and declaring it by Congress would favor the religious over the non-religious. And the text of the law makes it clear that it is a religious observance and nothing more.