Two devout followers of Jesus Christ had different doctrines on some important issues. One was a Jew by law and by birth. The other was a Jew by birth and Roman by law. Who did the correction? Yet neither man considered the other to be the leader {Pope} of the church nor submitted to the other ones authority.
So by who's authority and guidance was Paul under in Galatians chapter 2? Peters? Or The Holy Spirit? Read on the Chapter 3. Who receives The Holy Spirit? Just Priest? No. Just Deacons? No. Rather we are given The Holy Spirit by Faith. We have free will to listen and obey the guidance given us. Will man error? Yes. From The Holy Spirit comes correction. The instrument used may be Paul or it may be Martin Luther. It might be Billy Graham or a Pope that brings reform of Christ teachings over church dogma.
Most Christian Churches are not that far off the mark. They have legalist errors made by man but do not deny Christ as Lord and Savior and that is the key to this. This jealousy Christ dealt with when the Disciples came to Him telling Him other men were using His name healing and casting out demons
Mark ch 9 Whosoever shall receive one of such children in my name, receiveth me: and whosoever shall receive me, receiveth not me, but him that sent me. And John answered him, saying, Master, we saw one casting out devils in thy name, and he followeth not us: and we forbad him, because he followeth not us. But Jesus said, Forbid him not: for there is no man which shall do a miracle in my name, that can lightly speak evil of me. For he that is not against us is on our part. For whosoever shall give you a cup of water to drink in my name, because ye belong to Christ, verily I say unto you, he shall not lose his reward. And whosoever shall offend one of these little ones that believe in me, it is better for him that a millstone were hanged about his neck, and he were cast into the sea.
The churches even at that point has already gone out and The Word Of GOD The Gospel preached even by layman. The men Christ Disciples saw were of the many sheep and many flocks Christ spoke of.
For all the length of reply, you end up with the same problem: according to whom?
It should be clear that those who claim to be led in different directions to different doctrines by the one Holy Spirit are in error.
You read the epistles and acts and completely miss that there is authority in the apostolic Church. Not you.