There is the good behaviour clause concerning the courts, including the U.S. Supreme Court (translation: you're fired if we want to fire you, signed, the Legislature) and the orginal intention of the Consitution: That men shall govern themselves in line with the Constitution they created. We The People.
The Supreme Court is no different then any other Court, or Legislature, or Executive Branch, or the people in that their actions are to be executed with respect to the Constitution. If that action goes against the Constitution (and it was not an accident or a mistake in the way that the Constitution binds all the branches of government and the people to it) clearly states that ONLY the people have the power to change the Constitution.
The constitution clearly guarantees that there will be Freedom of Religion. If that freedom is to be diminished in any way, or completely obliterated, it can only be done by the people via a constitutional amendment.
The short of it. Courts are not allowed to make new law. That falls to the legislature. Courts can send it back to congress if it doesn't pass Constitutional muster.
So, who are the courts to tell the people that saying the pledge of allegiance with the words "Under God" is not permissable? Is that a law, or against the constitution?
Show me where in the constitution it says that if someobody is offended by your religion, you have to keep it out of sight and out of their hearing.
You appear to believe what they taught you in civics class. The Supreme Court has 'redefined' the constitution several times, most notoriously under FDR's threat to pack the court. In other cases, they have just invented new "rights" with no constitutional basis whatsoever. How many Supreme Court justices have been impeached?
The legislature doesn't do what the people want; they do what they are told by the lobbyists with access to the biggest bankrolls.
The short of it- Courts do make new law all of the time, and nothing is done about it.
And by the way - the "people" have no say on constitutional amendments.