Neither repressive politics nor repressive religion works...It depends on how you define "works". If you mean "allow freedom and liberty to bloom" then you are right, neither works.
But if you mean "able to retain power for decades or centuries" then they both "work".
Communism would still be in power in the Soviet Union if there had been no USA. And in fact, communism hasn't really been defeated, has it?
And Islam can create slave societies that last a thousand years, or more.
So slavery works. It most definitely works. If free people do nothing, slave holders rise up and build slave societies.
I guess when I say “works” I mean accomplishes what it SAYS is the goal.
It does accomplish its real goal, which is power for the ruling class. When people see it for what it is, sane people reject it, which is why both communism and Islam have to lie in order to get converts; communism lying by claiming not to be a religion, and Islam lying by claiming not to be a political system. In reality they are the same thing: a system whereby one supposedly-benevolent group of people (supposedly secular in communism and supposedly religious in Islam) dominates and controls everybody else by threats and punishment for dissenters.