And God also replaced the priesthood in the OT when it fell into corruption, Taking those "keys" away from the existing Priesthood.... Curiously this happened twice to the catholic church, The Great schism and the Protestant Reformation. Better check your keychainApostolic Succession has to do with authority. Christ gave His authority to the Apostles. The Apostles gave that authority to their successors, the bishops. Those bishops gave that authority to their successor bishops, etc. Authority is "given" not taken. Power is taken.
Today's bishops go back through a line of bishops to the Apostles. Christ established the Catholic Church, not man (unless you are considering that Christ was both God and man). It is not a manmade institution. It has, as its earthly leader, the Pope, the first of which was Peter. Christ set Peter as the first Pope to govern His Church on earth. Peter had successors, through today.
The office of Pope was established by Christ in Matt. 16:18-19. Every first century Jew knew that the king always had a second-in-command, who ran the kingdom in the king's absence (away at war, visiting another kingdom, etc.) or when he was incapacitated (sick, injured, etc.). This second-in-command would rule in the king's place, and the king, upon his return, would uphold whatever the second-in-command had ruled. (See an example of this office in Isaiah 22:22.) This position of second-in-command was dynastic. If he died, then another was appointed in his place. In other words, it was an on-going position. (Like the Pope.) The symbol of the office of the second-in-command was a large (2-3 ft.) key (or sometimes two keys), which he carried over his shoulder to let people know his authority. When Jesus gave Peter the "keys to the kingdom" (Matt. 16:19) He was clearly establishing such a second-in-command position, because Jesus (Our King!), was going to ascend to heaven and He needed someone to run the Church here on earth until He returned. The person that occupies this office has Christ's authority to do so.
If there is anything that describes the Papacy it is corruption, plain and simple.