It's pretty well described in the letter linked in the article (https://www.loc.gov/loc/lcib/9806/danpre.html), as well as in the 1st Amendment ("...make no law respecting an establishment of religion, or prohibiting the free exercise thereof").
But that specific phrase is not codified into law, period.
And there is a law outlawing Islam in the US, so where does that fit in?
"A wall of separation between church and state" What does that mean in your understanding.
It's pretty well described in the letter linked in the article (https://www.loc.gov/loc/lcib/9806/danpre.html), as well as in the 1st Amendment ("...make no law respecting an establishment of religion, or prohibiting the free exercise thereof").
But that specific phrase is not codified into law, period.
And there is a law outlawing Islam in the US, so where does that fit in?
islam is not a religion. It is a political ideology of hate, murder and slavery.
I normally say it's an organized plan for world domination, much like Scientology.
But the question remains "Where and how do you differentiate between 'religions' like Islam and Scientology, and actual faiths?"
Actual good faiths don't plan to take over the world in satanic dominion.