[Lucky Dog]

No act of Congress here.

I suggest you consult the Fourteenth Amendment.

All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the State wherein they reside. No State shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any State deprive any person of life, liberty, or property, without due process of law; nor deny to any person within its jurisdiction the equal protection of the laws.

[Hoodat]

I suggest you consult the Fourteenth Amendment.

I have.

No State shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States

The privilege or immunity in question here is an immunity against Congress' establishment of religion. Again, Congress was not involved. If you take a closer look at Amendment I, you will see that the only right granted is an immunity against Congress.