He was a Catholic who did not wish to leave the Catholic Church, but that is not the same as not being a Christian. This point is essential, considering that the Catholics and Lutherans have found common ground in the issue of justification: cf. here. If both Catholics and Lutherans have a similar view towards justification, then Luther is as much justified towards God through Christ as any Catholic.
The point may be essential. But it is also debatable.
CC
“If both Catholics and Lutherans have a similar view towards justification, then Luther is as much justified towards God through Christ as any Catholic.”
You’re assuming Luther had the same view as modern Lutherans like the Lutheran World Federation. That is doubtful. Thus, there is no immediate reason to believe - based upon an agreement about justification between the Church and a Lutheran sect in the late 1990s - that Luther is “as much justified towards God through Christ as any Catholic.” Luther was once justified, but then he embraced heresy and sin. Unless he repented of those heresies and sins, there is clearly a problem.
A smokescreen between Lib Lutherans and the Catholics. Rejected by confessional Lutherans.