Religions are vague, of course. This means that they are easy to follow -you can interpret their prescriptions as you like. but it also means that it is easy to slip up -there is always some injunction you are violating. But Islam has no religious establishment - no popes, no bishops - that can declare by fiat which is the correct interpretation. As a result, the decision to oppose the state on the grounds that is insufficiently Islamic belongs to anyone who wishes to exercise it.