How did sparation of powers pertect against tyranny

I suggest if you think a theocracy is such a good idea, you should move to Saudi Arabia or Iran. Since all religions are the same anyway, living under the oppression of Islam wouldn't be any different. The framers of the Constitution knew what damage religious domination could do. The secular warfare in Europe was recent history to those men; they knew the only way to avoid it here was to allow for freedom of all faiths, but to restrict their involvement in government.