Hodge, Cromwell, Church and State
“That, while no distinction should be made between various Christian denominations, and perfect liberty of conscience and worship be allowed to all men, nevertheless the Christian magistrate should seek to promote piety as well as civil order”
This leaves all too much unsaid. While I am not generally sympathetic to Roundheads, I find Cromwell both more succinct and more honest on this point: “As to freedom of conscience, I meddle with no man’s conscience; but if you mean by that, liberty to celebrate the Mass, I would have you understand that in no place where the power of the Parliament of England prevails shall that be permitted.”
On a related point, see that the CRC is trying to tone down the Heidleberg Confession on the matter of the mass.
And for a good introduction to the judicial innerworkings of church/state relations, see this decision rendered by the Tenth Circuit Court of Appeals.