Naturally whether I’ve missed the mark on my analysis will depend on the viewpoint one takes. Though from a Lutheran perspective I do not see my argument being problematic. I’ve been listening to Alistair McGrath’s work on Reformation theology in bits and pieces and to him it is evidently clear that Luther was concerned primarily with Justification by Faith alone. Ideas about the Church and what it was were left to the generation after Luther and Calvin to hammer out and this seems to suggest to me that Sola Fide really is an important doctrine within Protestantism comparable to that of the trinity.
Luther is not infallible within Lutheran theology so he can be critiqued but I do think I have a working knowledge of the reformation in general terms. So you would have to offer something specific from Luther to prove my evaluation of him mistaken, that he cared more over the corruption of the Catholic Church than it’s theology of Salvation.
I have said earlier that my concern isn’t mainly soteriological in asking this question. Rather it is to ask what is the essential definition of the Christian faith. Is Sola Fide part of that definition? To protestants the answer seems yes. This doesn’t mean that to all Protestants that Catholics and Orthodox who deny the teaching aren’t saved but that they do not have what Orthodox and Catholics might call the ‘fullness of the faith.’
Sola Fide is a non-negotiable for much of Protestantism, at least for those who care about what the reformers and their churches stood for. Some branches might disagree with it’s essential nature in Christianity, but am I wrong to say the majority or if not the majority, the conservative reformation would still insist on it’s absolute value and the ultimate reason for why schism with the Roman Catholic Church happened? If this is the case, are Catholics or Orthodox to be considered Christians technically since they have not accepted an essential formula of Christianity? If it is not an essential formula how important is it?
It does seem to me if Protestants want to consider Catholics and Orthodox Christians (and i’m glad most do) they have to deny the ultimate importance of Sola Fide. It can be very important, but not essential.
If you want to speak about Lutherans more specifically, then their understanding of the essence of the faith is found in the historic creeds of the Church.
Apologists (although I don’t know Alistair McGrath’s [sic] views on this specific topic), like to focus on the solas because, being critiques, they are more easily attacked. Plus, having been distorted from their Reformation understanding by subsequent groups, this makes for even more confusion and easy argument. There are endless threads here on sola scriptura treating that exact issue. But at least for Lutherans, setting up the solas as some type of “essence of faith” equal to or superior to the creeds would a huge straw man. Lutherans (thus) wouldn’t typically argue that Catholics and Orthodox aren’t Christians, because of the unity found in the Creeds.
You could perhaps be
much more convincing if addressing Evangelicals or Pentecostals—neither group seems to have much of a problem with Oneness Pentecostalism, for example, and many Evangelicals proudly claim themselves to be non-creedal Christians. And, it follows, that many evangelicals would have a harder time declaring Catholic and Orthodox to be Christians. So from a Lutheran perspective, your argument is actually
more problematic than it is from an Evangelical perspective.
I’m not sure how one would judge what “Luther was primarily concerned about.” Perhaps you could say that justification by faith was at the core of one of his most significant critiques of the Church. But there’s much more to his writings, teaching, and work than critique.
Lumping all Protestants together into “Protestantism” might make for simplistic apologetics (just scroll down the CA book list for example), but beliefs in Protestantism are extremely diverse, just to reiterate. Claims about Protestants and Protestantism are almost always by definition, errors at least in part.
If you’re interested in the Reformation, I’d suggest beginning with more objective sources on the history of the Reformation (e.g., Cameron’s
The European Reformation), and then if you really want to move on to apologetics, you will have something comparative to work with.