It's not just kids that don't know the history of their country...

It's Supreme Court Justices as well. Slate has an article about the arguments before the court concerning display of the "ten commandments".

In it they quote Justice Scalia (the one most likely to be promoted to Chief Justice should the present chief not return from his convalescence): that the commandments are "a symbol of the fact that government derives its authority from God,".

Is Scalia just asserting his personal opinion? Or is he just getting the Declaration of independence wrong?

Here is what the Declaration says:

We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness.--That to secure these rights, Governments are instituted among Men, deriving their just powers from the consent of the governed,

The "Creator" (not God, it is an important distinction, not just a semantic issue) made us free, and governments derive their power, not from the "Creator" but from us, the created, and the free.

Tsk, tsk Scalia. Your bullshit is showing. I think the Justice needs a remedial High School level US history class.

Thanks to wAitiNG foR doROthY for the pointer.