Priestly and monastic vows are to Christ. This being said, calling the Bride of Christ satanic is an act of moral depravity in itself.
I did not call the Bride of Christ satanic. I called the church of Luther's time satanic, unless you consider Sixtus VI's decadence, Innocent VIII's illegitimate children, Alexander VI's "Dance of the Chestnuts" orgy in the Vatican, mistresses, illegitimate children and murder - Godly behavior worth following. I thought not.
As to the Priestly and monastic vows, if one is not a Christian when he makes such vows and later becomes a Christian the sin of vowing to begin with is covered by the blood of Christ and the brother is free.
Luther was not a Christian when he called on St. Anne to save him. He later became a Christian realized that the church that he had made the vow to serve in was evil. He spent the rest of his life serving God as a pastor and professor - but outside of the Roman Catholic church.
If one made a vow today to serve Muhammad as a Jihad warrior but then became a Christian; or since you say that the vow of the non-Christian Luther was to Christ, say someone makes a vow to Christ for some reason to LITERALLY die to self by killing one's self. Certainly that person misunderstood what dying to self meant. Now that he understands the truth is he still bound by the vow or is he freed by the forgiveness of Christ and washed clean from ALL sin? He is free. Luther too was free. He was free to leave an evil institution and preach God's Word. He was free to marry Katherine the EX-nun who had been placed in the Benedictine cloister by her family at the young age of 5. Transferred to a Cistercian convent before 16, and who finally escaped with other nuns and soon found Dr. Luther. The rest is history.
Theirs was a true love story blessed by God, and Catholics have been so trained to hate them that they would deprive them of that which God had blessed and call their marriage an act of moral depravity. Seems that the "Church" would rather point at the specks in Luther's eye than deal with the planks in its own from that time.
Luther shook the dust off of his feet from immmoral Rome. Rome has never forgiven the challenge to their power.