But doesn't the First Amendment prohibit government from writing laws respecting an establishment of religion?Oh, so does it have to be a 'recognized religion' to get the special perks?Satanists?
The Church of Satan is a recognized religion in the United States
Yes.
Yes, but they are not establishing a religion, just recognizing it. As long as they use the same criteria for all, then there is no problem.
When government writes laws that offer special favors to recognized religions, that's "law respecting an establishment of religion". And it is a problem because it basically turns the First Amendment inside out. The point of the first was to prevent government from playing favorites with religion. But as soon as we designate some religions as 'recognized', and others as not, we're playing favorites. We're doing exactly what it was supposed to prevent.