Biblical law is covenant law, the terms God dictates to His covenant people and to all mankind. A frequent argument against biblionomy is that a significant portion of biblical law was proposed historically to ancient Israel as a covenant nation, that this covenant nation occupied a unique role in the plan of God, and that since no other nation bears this unique character, the law required of that nation expired with that nation's covenanted status. Covenant law binds those within the sphere of the covenant. All men stand within either the covenant of Adam or the covenant of Christ. No man stands outside a covenant relation to God.
Every law system reflects the religion in which it is immersed.
It is the religion, not the law, that is ultimate. For this reason, Christians today in political office are not called to press for the immediate implementation of biblical civil legislation. This implies a nation covenanted with God. Another means is requiring Christian test oaths for the civil magistrate and for all voters in a democracy. We are far, far from such a covenanted status in modern Western democracies, however, and even farther than this from implementing biblical civil law.