Protestantism and the Suitability of the Reformers

Here's a brief and plausibly sound argument:

1. If Protestantism is true, then the reformers (e.g. Luther and Calvin) were specially selected by God to renew his church.
2. The reformers were not specially selected by God to renew his church.
3. Therefore, Protestantism is not true.

(Note: By "Protestantism," I do not simply mean "anything other than Catholicism and Orthodoxy"; I mean adherence to the traditional solae of the Reformation, such as sola fide, sola gratia, and sola scriptura.) 

Premise (1) seems obviously true: if the Protestant Reformation really was what Protestants claim it was, then it must be the case that God specially raised up the reformers in order to effect the restoration of the apostolic faith.

Premise (2) is motivated by the obvious moral and doctrinal faults of the reformers. Luther tolerated polygamy by Christians, doubted the canonicity of various New Testament books, and (most serious by far) openly called for the persecution and murder of Jews. John Calvin was a minor tyrant, who played an important role in the execution of Michael Servetus for heresy. These actions and beliefs simply do not reflect what we would expect to see from men specially raised up by God.

One might object that God frequently uses sinners to achieve his purposes. Moses was a murderer, while St. Paul persecuted Christians and approved of St. Stephen's being stoned. But the difference is that these men engaged in these sinful actions before their calling, and there is evidence of their having subsequently changed their ways. Indeed, St. Paul's letters are filled with self-condemnations and proclamations of remorse concerning his former behavior. By contrast, the reformers' awful statements and actions took place after they had made their break with the Catholic Church, thus beginning the Reformation. So we would have to assume that these men, having already been raised up by God, were continuing to make serious moral and theological errors. That seems implausible.

One could also point out that many Catholic authorities have done horrible things. After all, if we are going to condemn Calvin for the execution of Servetus, should we not also condemn the Catholic Church for the killing of many thousands of heretics? The difference here is that the conduct of Luther and Calvin strikes at the root of the Reformation: these were the men who, if Protestantism is true, were selected by God to be his instruments of restoration. The Catholic authorities who persecuted heretics simply do not play as important a role in Catholic history as the reformers do in Protestant history.

In brief, I find it simply impossible to believe that the reformers were what Protestantism requires them to have been. This seems like a serious objection to Protestantism itself.