At the time of the Reformation such a thing as an Unchristened Christendom seems not to have been thought possible.
"A Short History of the Book of Common Prayer"
William Reed Huntington
The first part of the road, all the way to Doveness, was so wretched it could hardly be called a road, and of course Eric had to drive very carefully, since he had the Unchristened child to convey.
"The Emperor of Portugallia"
Selma Lagerlof
When, therefore, the child is born, let him be delivered unto me, Unchristened, at yonder postern-gate, and I will bestow him in the care of this good knight."
"The Legends Of King Arthur And His Knights"
James Knowles