[Jim Robinson]

It's called federalism.

From the Preamble to The Bill of Rights:

THE Conventions of a number of the States, having at the time of their adopting the Constitution, expressed a desire, in order to prevent misconstruction or abuse of its powers, that further declaratory and restrictive clauses should be added: And as extending the ground of public confidence in the Government, will best ensure the beneficent ends of its institution.

From the first amendment:

Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof...

The tenth amendment:

The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.

[Theoria]

Demographics. Ebb and flow. No longer will it be Bible readings, but things people might not want.

Just a observation.

[BenLurkin]

A lot of confusion over the years might have been avoided if the 10th had been put first in order.

[christx30]

The way I was reading the OP was that Congress,and Congress alone is bound by the First Amendment. All others can do what they want.
I know local goverments are also bound to it (new york, notwithstanding).