As per Deuteronomy 26, the entire population of Israel covenanted to obey the law of God - i.e., religious law, not civil law. You were saying something about the separation of church and state...
As per Deuteronomy 26, the entire population of Israel covenanted to obey the law of God; both religious law and civil law. All Ten Commandments -- both Tables, Religious (I-V) and Civil (VI-X).
What I was saying about the "separation of church and state" is this: following the Pentecostal (the Bible, not the Denomination) extension of the Gospel to Gentile Nations, the division of Duties between Magistrate and Presbyter has been brought into greater relief -- for Gentile Magistrates, not being allied to the Pre-Messianic Levitical Priesthood, are charged by the Apostle Paul with the execution of the Second Table of the Law, the Civil Law (see Romans 13:8-10, the explanatory exposition of Romans 13:1-7). To wit: punishment of Murder, Adultery, Theft, Fraud, and general Abusive Malfeasance (covetousness) -- and, for the most part, that's it.
The Civil Law of the Magistrate and the Religious Law of the Presbytery are, under the New Covenant, particularly executed under distinctly separate offices.
My point was simply this -- even under the Old Covenant, the division of Duties between the Judge and the Priest, while allied under that Old Covenant, were nonetheless distinct. Even then.
Best, OP