Well, it sets out the parameters, limitations and underpinnings of codified law found elsewhere.
Not really. Check out the preamble. "We the people, in order to..." no "establish or protect a Christian state" in sight, though it's a clear statement of founding principle and the inclusion would have been easy enough, as it would have been in the Declaration.
A decision widely recognized as both unjust and questionable as a matter of law in relation to Constitutional protections. See: Ex Parte Endo. The camps were undone before the war actually ended, in large part because of the challenges to the action. Congress appointed a committee to look into the episode and it concluded it was largely an unreasonable product of wartime hysteria and racism. Reparations were paid out to many in time.
It's a dark moment in our nation's history, but unsurprising given the anti-Semitic and racist streaks that ran through Roosevelt (see: his treatment of Jesse Owens and slow to no action in relation to Jews he knew were being slaughtered, appointment of Klan friendly Justices and general coziness with racist policy).
Do you even know anyone who has been to Arlington?
lain: Historically, crosses marked graves because most of the people lying there were Christian.
You want a list of religions that would be comfortable with the word Creator?
Again, you want the list?