Dear all Protestant nations and all Christians who stand against the tyranny of Papal interference in our faith
It is our right that to practice our faith as we see fit without interference without the machinations of the Papacy interfering in our lives. It is the right of every man to be a member of the Universal Priesthood of Man. As Luther and Calvin reminded us we are all part of a Royal Priesthood. We are by Christ all given the right to preach; to hold our faith in him. It is not the duty of the Pope to pass down doctrine or determine arbitrarily where the Priesthood lies. Similarly it is not the right of the pope to offer us salvation in the form of indulgences. Returning to the catholic church will not as they tell you redeem your soul. It is through faith alone that that we can achieve forgiveness. You need not seek absolution in the eyes of the church as Christ forgives all who truly repent.
We must not let the Papacy control our faith. Our faith is determined by scripture and the teachings of Christ not some man in Rome. That man is not Christ neither does he have the right to say he anything close.
However this is already known to all of you, and knowing the strength of your faith I call upon all of you Lutheran, Calvinist, Anglican and any others who the Pope looks down upon to stay truthful to your beliefs and values and not to be afraid in the face of the Pope and his allies. It is thus proposed that we brothers, united under the threat, should agree that none of us are to harm another until we can be free from the persecution of the Catholic Church.
Remember the early Christians - persecuted continually by Romans and Jews but they held on to their faith and it guided them through just as now it shall guide us through this time of persecution. The Pope is a new Diocletian, but we shall persevere through this our Faith the Lord shall be our guide.
-Cuthbert Tunstall Prince Bishop of Durham
tl;dr: Propose a mutual non-aggression agreement between protestant/orthodox/other heretic nations.
To the Pope In Rome
I Prince-Elector of The Brunswick-Lüneburg, Rhineland and English Palatines Ernest the Confessor do not accept your offer. Perhaps you are here to lead us all astray or to test our faith for I see no other reason why a man such as you would rise to such a position of religious prominence. And as we were taught by Christ I shall shun your offers, you offer naught but damnation and in no sense the promised salvation. In Faith alone am I justified.
-Prince-Elector Ernest the Confessor
To the Irish Invaders
The illegal occupation of our territories in Lancaster, Cumbria and Westmorland will not be tolerated. We suggest that these territories should be peaceful given back, perhaps in exchange for some compensation for the damages we have caused you. We will not tolerate your occupation and if you do not acquiesce we shall be forced to take drastic measures.
-Charles Neville, 6th Earl of Westmorland
Thomas Percy, 7th Earl of Northumberland
Thomas Neville, 19th Earl of Warwick
Edward Perceval, 4th Duke of Lancaster
Richard of Shrewsbury, 4th Duke of York
Cuthbert Tunstall Prince Bishop of Durham