So help me God
Remember Karl Marx, "Religion...is the opiate of the masses." Marxist believe that religion offers a false hope to relieve the suffering of "the oppressed", which in their view essentially blames faith in God as the hindrance to carrying out Marxist programs.
Perhaps Obama would delete that part. It does, however, fit in with the rest of the oath in the original (translated):
"I swear to you, Adolf Hitler, as Fuehrer and Chancellor of the German Nation, loyalty and bravery. I vow to you and to my superiors designated by you obedience to the death. So help me God."
Very little change needed as the intent is essentially the same.