I will add that in Vietnam right now all religious activities or organizations must be registered with the government and approved by the government. They have used this requirement for two purposes. One is to crowd out and neutralize.... Actually, they have outlawed and banned many of the churches, including the largest religion in Vietnam, the Unified Buddhist Church of Vietnam. That's the largest. It remains outlawed to this day.
In place of that, they register and approve a state-sanctioned church they created, and in many cases they appoint communist cadres to serve in the leadership of those churches, to control those churches. Then they will take the land, the properties, the temples, and the churches from the outlawed ones and pass them and transfer them over to the one controlled by the government. To the outside world it looks like there are churches, there are religions, there are religious activities, but they're all controlled by the government.