Do Protestants believe that acceptance of their canon is an essential matter of faith?

Do any Protestant Christian movements/denominations believe that acceptance of the 39 book 'Old Testament/27 book 'New Testament', and **only** those 66 books as scripture is an essential doctrine of faith? Do any Protestant denominations require such a declaration? Why or why not? For instance, is there a theological problem in Protestantism if a clergy member/lay person sincerely believed the academic consensus that the Second Epistle of Peter was not scripture? Or would protestants believe there a problem if the same person sincerely believes that 1/2 Maccabees are scripture?