I hope it's ok to just offer some further information in response. Some Protestants do rely on sola scriptura, but very few actually practice it. If you go to the official websites of various Protestant denominations, you can see for yourself which parts of the Tradition have been retained as dogma. The United Methodists, for example, have The Book of Discipline, the Missouri Synod Lutherans have the Augsburg Confession, among a few other things, and even the various Baptists have confessions and statements of faith. All traditional Protestant churches, moreover, recognize and confess as authoritative the Apostle's Creed, the Nicene Creed, and the Athanasian Creed. (That does not include the Baptists, who are non-creedal).
The problem may be that, unfortunately, the loudest and most visible Protestants are usually also the most ill-informed.