They are duly appointed Constitutional officers whose job it is to resolve disputes brought before them. I suggest you read the opinion. I provided a link in post #1.
Do they have expertise on school curriculum?
More, apparently, than the lying bozos on the Dover school board. Again, I invite you to read the opinion.
How did we get to this place?
The Constitution was ratified. And then the First Amendment.
Get the judges out of education.
As long as we have government-run schools (which don't thrill me), and a First Amendment, and clowns who disregard it, I'm afraid you won't get your wish.
It's still wrong and anti-democratic. I know little or nothing about "creationism" or for that matter "evolution". I do know the framers did not build the judiciary for this. This is more power grabbing by a judge, it needs to stop.