Which is *very* strongly implied by scripture (Luke 3:8) Bring forth therefore fruits worthy of repentance, and begin not to say within yourselves, We have Abraham to [our] father: for I say unto you, That God is able of these stones to raise up children unto Abraham.
They would argue that faithfulness to the Bible and/or the teachings of Christ is a better measure of authentic Christian faith than the ability to trace one's spiritual ancestry through an ecclesiastical bureaucracy.
Again in the Bible Matt. 15:3-6, font color=red>"And He answered and said to them, 'And why do you yourselves transgress the commandment of God for the sake of your tradition? 4For God said, Honor your father and mother, and, He who speaks evil of father or mother, let him be put to death 5But you say, Whoever shall say to his father or mother, Anything of mine you might have been helped by has been given to God, 6he is not to honor his father or his mother. And thus you invalidated the word of God for the sake of your tradition."
A peripheral knowledge of the lives of some of the medieval and early modern popes (e.g., Stephen VI, Sergius III, Innocent VIII, Alexander VI) is enough to call the insistence on apostolic succession into serious question. Moreover, the Avignon Papacy and the divided lines of papal claimants in subsequent decades calls into serious question the legitimacy of the whole approach. Perhaps the strongest argument against the necessity of apostolic succession comes from the Apostle Paul, who was an acknowledged apostle despite not having been ordained by one of Jesus' original twelve disciples. In fact, Paul makes much of the fact that his authority came directly from Jesus Christ rather than from one of the apostles (Gal 1:11-12). Apostolic succession was a useful tool for combating incipient heresy and establishing the antiquity of the churches in particular locales, but merely stating that apostolic succession is a necessary prerequisite for being a true church does not make it so."
Paul was appointed an Apostle by Christ just like the others were. He then appointed other bishops, who are the successors to the Apostles