I am not sure that that is necessary.
Simply, religions should have no independent judicial powers, nor be allowed to self regulate in matters that break national laws. Withholding information from the State in these matters should incur major prison sentences, fines and perhaps the closure of the institution.
The Roman Catholic Church regards itself as above all sovereign states and above all temporal legal systems. This is not just an attribute of the RC Church but is fundamental to the theology of its existence. Christ made St Peter his successor and the pope is the successor of Peter. Just as Christ is subservient to no-one, so the RC Church is subservient to no one. The Holy Ghost speaks through one, holy, catholic and apostolic church (and the RC church believes it is this).
If the RC were to lose its independent judicial powers it would cease to exist. It would not become a RC church stripped of these powers, but would have denied its own foundation document (The Nicene Creed) and therefore its own existence. I would like this outcome (so good luck with your policy!) but it isn't going to happen.
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All churches (and I suppose all religions) have a potential friction surface when their own views conflict with the laws of the state. There are times when (with hindsight) we surely all agree with churches that stood against the state in some areas. For example there were some Christian denominations that stood against Hitler, and I think we all today praise them for this. The RC Church in effect accepted Hitler, and today we surely all condemn.
Quakers in the slave-owning states of the USA had many problems around their belief that slavery was wrong. Many stood against slavery and helped fleeing slaves. The "underground railroad" from the southern states to Canada was a largely-Quaker and low-Church project. I assume that today we all think the Quakers got it right.
I do think that Churches can and should on occasions stand against nations and legal systems. However there has to be full scrutiny. In the case of the Quaker rail-road the decisions of individuals were subject to scrutiny within that church (through what is called a "meeting for clearness"). This is a process that would have happened thousands of times with a lot of soul-searching, reflecting the seriousness of opposing the law. It is a process fundamentally different from the RC cannon law system where a doctrine from a Church Council is applied.
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I think the problem you set out
@Drifterwood is within the RC Church itself, not in the way society or nations try to legislate. The Westminster Confession sets out the view that the pope has no jurisdiction over the magistrate (XXIII) - surely your view and mine. However he pope claims precisely this power. The Westminster Confession addresses this in XXV. It does so in colourful language, and I know many get hot under the collar. The pope "exalts himself" in claiming a power he doesn't have. As the WC says that that power is Christ's the pope is termed the anti-Christ.