The Reformers were divided on the question of Christmas celebration.
The Church historian in question suggests we split the difference. Luther was for the celebration of Christmas and all of other traditions that he deemed did not specifically undermine or contradict the gospel. The Reformed wing of the Magisterial Reformation tended to argue that ecclesiology is also regulated by Scripture and therefore Christmas was suspect.
Davis dodges the theological issue and tries to create a binary dilemma between sacred and secular elements of the Christmas celebration - enjoy it, but be careful.
But that's not the issue if we're talking about the divide between the Reformers. This is to miss the point entirely.
