That's interesting, I didn't know that. Are all supremacists banned or just white ones?
If some kook considers Hitler a god and nazzism a religion can therefore be banned from serving in the military then I guess there is a committee somewhere that makes legitimacy judgments on religions.
If some kook considers Hitler a god and nazzism a religion can therefore be banned from serving in the military ........ .
Nazis and neo-Nazis are not banned by the U.S. Armed Forces on religious grounds. They are banned on national security grounds as Nazism is openly hostile to the Constitution.
Even if a Nazi were to worship Hitler, he would still be banned on national security grounds, not his religion, so your issue is a red herring.
....then I guess there is a committee somewhere that makes legitimacy judgments on religions
During the days of our Founding Fathers, there were such committees in the Old World: the Inquisition, the British Parliament passing laws said that that Catholics were not allowed equal civil rights....
That is why the Founding Fathers drafted the First Amendment: To ensure that America never had those religious committees you want.
If you want such committees, convert to Islam and move to Iran. The Iranian mullahs have such committees.