The First Amendment is being tested there, right now, by banning books and controlling the information taught to children. If they are allowed to win that battle, we have lost much more than just a fight over some books in school.
Fascism begins with the control of information. That's why the First Amendment is first. Because it's the single most important one, the first one that any attempt to impose fascism will need to defeat.  If fascists dismantle the 1A they win, they control the information. If they lose this battle, information about what they're doing will travel freely which is what prevents fascism from taking hold.
This is a First Amendment battle. This is fascism trying to squash free speech. There's a LOT riding on this.