Christianity? -- well, Morris says that all religions are the same. Christianity and Islam are fundamentally different religious traditions, and not only because the former has exhibited a far richer scholarly tradition, which is rather visible in the immediate fusion of Greek philosophy, Roman Law, and Christian theology in the first centuries AD, not to mention the Middle Ages, but because in Islam the idea that Allah has limits to his own powers, by making an everlasting covenant, with human beings, is unthinkable, in that Allah is viewed as absolutely transcendent; whereas for Christianity the authority of the earthly rulers is limited by God's law, which both grants rights to every person and holds that God is conterminous with Reason. There is no self-limitation to the sovereignty of Islamic rulers, and for this reason Islam has faced great difficulties producing a secular political order subject to constitutional checks and balances.