In an excellent piece on the divide between the Remain-supporting clergy and the Leave-leaning laity of the Church of England, Giles Fraser makes this observation:
The job of the church is not to be a faintly Left-wing lobbying group for a slightly more redistributive tax policy or a more European focused Brexit deal. The job of the church is to point to this “other country”, God’s kingdom, and to set family, church and nation under its domain.
Religious left people love to decry “Christian nationalism” amongst their opponents, but they’re blind to the fact that they’re more often than not shilling for another form of nationalism (in this case the Procrustean and undemocratic EU, something Fraser explains elsewhere) and not for the true internationalism that the Christian Church as a whole was meant to have by its Founder.
Adopting that true internationalism will force people across the board in Christianity to abandon their pet secular goals, but that will be for the better, too.