They tried this in Russia a few years ago. Everything that is prohibited comes around (hard). Better to have it slowly getting extinct over a generation or two. The only problem we have to overcome is the exporting of the religion and have it seed somewhere else, getting more stricter, more correct, than it was where it came from. While I agree with the general vision, the next worst thing to religion is someone that considers himself god and uses politics to get more equal than someone else. This kind of social behavior is a dynamic system with a certain theme to justify itself, it is still bound to rules. These rules are set by nature, either evolving to an equilibrium, directing in a binary split between followers or a collapse aka death.
With this nice modern internet age transparency it is possible that people actually manipulate what the word sees. Either by the availability of people to see it first hand, the limitation on publishing or damn copyright that prevents others to spread it. Just wondering what anyone can do about a country that riots because of its bad rulers. Is supporting their freedom of information the only thing we can do?