Some believe a Christian has no authority other than God and Jesus, and indeed all Christians have this authority.Why do you folks need to believe in "authorities", anyway? I don't get it.
Is it so that you can abdicate responsibility for making your own determinations about right and wrong?
We have the Bible for an authority, or it is authoritative.
And in the Bible we learn about authority in the church. But that is a word, authority, that we can use to describe it. The point is that authority in the church is not like authority in the world. For example, we know from the Bible that the least is the greatest in the kingdom of God.
In the church it makes sense that those who are humble, and truly, would be able to make disciples the way Jesus did. And to make disciples of Jesus rather than disciples of their own.
A disciple is basically a student. A student of God and the word of God. It makes sense to follow after God. He has given each person a conscience to know right from wrong. But sometimes we need help, for example, in understanding the scriptures. Some people are gifted in communicating the gospel, for example... or explaining the scriptures at the leading of the Holy Spirit. So this is all a little bit different from people looking for a position of authority. It is instead authority demonstrated, and the work of God rather than the work of man.
To know and understand the scriptures are both important. Not everyone knows offhand what the scriptures say. Those who know can help point out what the scriptures say to those who do not. But this is basics. And God blesses those who come to Him in faith, trusting in Him and giving their life to Him because Jesus the Christ God's Son gave His life for them. In Jesus we have the forgiveness of sins because He died for us (a substitutionary death). That is true authority, laying down one's life for a friend.
John 15:13 NASB - "Greater love has no one than this, that one lay down his life for his friends.
1 John 3:16 NASB - We know love by this, that He laid down His life for us; and we ought to lay down our lives for the brethren.
1 John 4:10 NASB - In this is love, not that we loved God, but that He loved us and sent His Son to be the propitiation for our sins.