Martin Luther stated that the doctrine on which a Church Stands or Falls is Justification by Faith Alone without the works of the Law. The Reformed Baptist, Robert Zins uses this statement of Luther to prove that Catholics are not Christians. If one reflects on Luther's statement, you can see that all the Fundamental Doctrines of the Faith such as Total Depravity, Divinity of the Lord Jesus, Substitutionary Work of the Lord Jesus on behalf of His Elect can be deduced or found in the Doctrine of Justification by Faith alone. The Roman Catholic (even the Orthodox) Churches openly and explicitly deny this most Vital Doctrine, therefore they are not Christians, because by inference they are also denying the other Doctrines of the Faith which hang on Justification by Faith alone. James White in his book on Justification says something similar. Mueller in his Christian Dogmatics(LCMS) backs up Luther on that statement. But Mueller unfortunately refuses to draw the logical conclusion that Roman Catholics are not Christians. Any thoughts on this.