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Pope is not a term used in the Bible. The Bible does not record that Peter was ever the head of the Church at Rome. If it is a proper basis for the Pope’s authority one would expect it to be made very clear in the Bible and yet nothing is said about it.
‘Pope’ is Latin for ‘father’ and as a title stands in direct contradiction of Christ’s words:
Matthew 23:9 "Do not call anyone on earth your father; for One is your Father, He who is in heaven.
Roman Catholics use the legend of Peter being the first head of the Church at Rome to support the Pope’s authority. The line of succession of the Papacy comes through some of the most godless men who ever lived, intermingled with anti-popes and sometimes two or three claimants at the same time. The history of the church should convince any rational person that if a tree is known by its fruits then the Roman Catholic Church has nothing in common with Christ. What have the crusades, the inquisition, the St. Bartholomew's Day massacre, burning at the stake for possessing a Bible, etc. got to do with Jesus Christ? The Roman Catholic Church provides the best fit for the Mother of Harlots and Abominations of the earth in Revelation 17. Nothing else in history comes close.
The real test for Roman Catholics is whether the Bible supports their doctrine. This I suggest is the only way to decide the credentials of any church.
I hope this helps.