Hodge on Disestablishment
In 1863 Charles Hodge summarized how we Scripturally argue against civil "establishment" of the church in 3 points.
First, he says the proper task or duties of the church and civil governance “must be determined from the Word of God. And when reasoning from the Word of God [on these points], we are not authorized to argue from the Old Testament [old Mosaic covenant] economy [or administration] because that was avowedly temporary and has been abolished, [instead, we] must derive our conclusions from the New Testament. We find it there taught:
(a) That Christ did institute a church separate from [civil governance], giving it separate laws and officers.
(b) That [Christ] laid down the qualifications of those officers and enjoined on the church, not on [civil governance], to judge [which men in the church meet those qualifications].
(c) That [Christ] prescribed the terms of admission to, and the grounds of exclusion from, the church, and left with the church its officers to administer these rules.”
Second, Hodge says “the New Testament, when speaking of the immediate design of [civil governance] and the official duties of the magistrate, never [suggests] that [magistrates have] those functions [related to religious belief or practice that establishmentarianism proposes]. This silence, together with the fact that those functions are assigned to the church and church officers, is proof that it is not the will of God that they should be assumed by [civil governance].”
Third, Hodge says “the only means which [civil governance] can employ to accomplish many [duties proposed by establishmentarian, such as suppressing heresy and preventing false worship], [namely, by coercion], are inconsistent with the example and commands of Christ [concerning faith and worship]; [and inconsistent] with the [liberty] of Christians, guaranteed in the Word of God (i.e., to serve God according to the dictates of one’s conscience); [as well as] ineffectual to the true end of religion, which is voluntary obedience to the truth; and [are] productive of incalculable evil. …By enjoining [duties concerning faith and worship] upon the church, as an institution distinct from [civil governance], [the New Testament] teaches positively that they do not belong to the magistrate, but to the church.”