FDR refused to allow JEWS in during WW II and sent the ship back to Germany, for all on it to die.
FDR didn't kill all German, Italian, and Japanese people in America.
Obama's administration has already tried to and may have done so by now, an immigrant European Protestant family, because they were home schooling their kids.
Any future Congress and/or president might try to do what you claim; they certainly SHALL do that, once the dxamned Muslims take over this nation !
And FDR should burn in hell for that. So if a Democrat has already done that with Jews, what's stopping them from doing it against Christians?