It's about sacraments, not preaching. Let me get this straight: Luther was upset with some corrupt practices by some Church officials, correct? So, he decided to "reform" these bad practices and instead changed the theology, correct? In otherwords, the Church was wrong ecclesiastically and theologically for 1,500 years according to Mr. Luther. If that is true, then not only is the Catholic Church in apostasy for two millennia but so is the Orthodox Church as well.
I don't for a moment doubt that Lutherans belive with all reverence, but that doesn't mean that a church is any one, any time, any place. Remember, the devil is also a believer. So what does that make a group of demons? A "church?"
If our Lord wanted all of us to be Protestants, He would have given everyone a Bible and said "Read it!"