"God had used Luther to restore the gospel"
"This is laughable. If Luther had read the Gospel, it never showed."
It's easy enough to say that, but it's much more difficult to prove that. Luther read the Gospel, and the Law, and the Church Fathers; his writings clearly show that. That he came up with a different conclusion is obvious. Beware of contempt for your opponents; it can lead to pratfalls in the long run.
I specifically think that Luther missed the meaning of most gospels, in particular, Matthew, as he developed his theory of salvation through faith alone. While we all agree that works done mechanically, without conversion of the heart, are not salvific, works of charity that fortify faith are clearly commanded by Christ. It is of course a gross simplification to say that Luther never read the gospels, and I say so somewhat humorously, but I think that his theory was speculative theology with narrow scriptural support in some passages in Romans and Galatians, which he interpreted in a way that contradicts the bulk of the gospel.