In the western world, church and state are separate. The church does not have power over the states but the states do have the power over the churches if they are breaking the laws.
Don't even let the catholic try to mess with the constitution of Viet Nam. That is what we call church and state is one and that is not right. Let the constitution of Viet Nam mimic the constitution of United State and it should work out very good. Follow the foot step of the super power country and Viet Nam can never go wrong.