The one sticky thing about orthodox Lutherans, is they affirm that the church only exists "where the sacraments are rightly administered" (i.e. according to Lutheran doctrine). I'm curious, where did they think the church was during the Roman Catholic years before Luther when a non-Lutheran transubstantiation was believed? Do they believe that, say, Baptists (with their symbolic communion) can't be Christians?
No. XPians live by Grace through Faith in Christ. Lutherans do not deny the existence of XPians in any other Trinitarian denomination.
We teach that those who hold to a "symbolic communion" are not properly conforming to the Church (Body of XP) as established by Him.
Ephesians 2:8-9