Luther's signature insight on the sacraments was that God’s word of promise doesn’t just symbolize an absent reality but that it gives and bestows God’s real favor.
Christians are free to engage in political matters, even as Christians, but the church as an institution has a responsibility not to lobby for specific political ends, however worthy and just they might be.
Divine election is nothing other than God’s freedom and power to choose, and He has made His word the instrument by which He makes His choice about you.
Being a member of a church connects people to the whole reason the church has for existing: that we might obtain justifying faith in Jesus Christ through Word and Sacrament.