I have little patience with the Catholic haters who spew their vile on this forum, but one made an excellent point once like a blind squirrel finding an acorn.
That point was that the Protestant Reformation saved the church from itself, and perhaps Christianity along with it.
The church had grown so corrupt by the early 16th century that government power and the perks which went along with it had grown more important than propagating the Gospel of Jesus Christ.
Good men like Martin Luther and evil men like Henry VIII played the role of ending the government power monopoly and forced the church to refocus on it core spiritual mission. Prior to that time, many Popes has become as corrupt as the church itself and, in fact, led it down the wrong path. After that time, competition forced the church to refocus on spiritual matters just in time to allow it to save southeastern Europe from another invasion by the Muslim hordes in the late 1600s.
Count me among the many, many Catholics who would agree with you that Martin Luther did the Catholic Church a HUGE favor.
Church leadership at that time was out of control, and certainly not acting Biblically.
FYI, at Christmastime you will often hear Away in a Manger played at Catholic Mass. Martin Luther is credited with being the author of that hymn. Perhaps a tacit admission by the Church that he had a point. Hearing that at Mass 50 or 60 years ago would have been unthinkable.