Not quite. For one, the Eastern Churches (Eastern Orthodox, Oriental Orthodox, and the Assyrian Churches) have never had a doctrine of Purgatory. So Luther's rejection of Purgatory was not some innovation on his part, but was two-fold: That the Christian passes through judgment to life solely on the merit of Christ alone, and the doctrine of purgatory was itself a late innovation and one which was saturated with abuses in his day.
Also, it's important to understand that the term "Protestant" doesn't refer to Luther protesting anything; but actually refers to the German princes who protested the decree at the 2nd Imperial Diet of Speyer (the Holy Roman Emperor decreed that all the princes had to enforce the Roman religious practice and outlaw Lutheran practice). The Lutheran German princes formally protested this decision, and they became known as "The Protestants" for their "
Protestation at Speyer". When Luther nailed the 95 Theses to the church door in Wittenburg, it wasn't a protest, it was an invitation for academic debate on the subject of indulgences; Luther also sent a copy of the 95 Theses
along with a letter to his Archbishop (Albert of Mainz) in which he appealed to the dignity of the archbishop and also of the pope. Here is how the 95 Theses begin,
"
Amore et studio elucidande veritas hec subscripta disputabuntur Wittenberge, Presidente R.P. Martino Lutter, Artium et S. Theologie Magistro eiusdemque ibidem lectore Ordinario. Quare petit, ut qui non possunt verbis presentes nobiscum disceptare agant id literis absentes. In nomine domini nostri Hiesu Christi. Amen."
Translation from the original Latin:
"
Out of love for the truth and the desire to bring it to light, the following propositions will be discussed and defended at Wittenberg, under the presidency of the Reverend Father Martin Luther, Master of Arts and of Sacred Theology, and Lecturer in Ordinary on the same at that place. Wherefore he requests that those who are unable to be present and debate orally with us, to do so by letter."
That's not a protest, that's a department head of a university inviting academic discourse.
-CryptoLutheran