Acts 8:29 Then the Spirit said unto Philip, Go near, and join thyself to this chariot.
8:30 And Philip ran thither to him, and heard him read the prophet Esaias, and said, Understandest thou what thou readest ?
8:31 And he said, How can I , except some man should guide me? And he desired Philip that he would come up and sit with him.
8:32 The place of the scripture which he read was this, He was led as a sheep to the slaughter; and like a lamb dumb before his shearer, so opened he not his mouth: 8:34 And the eunuch answered Philip, and said, I pray thee, of whom speaketh the prophet this? of himself, or of some other man?
8:35 Then Philip opened his mouth, and began at the same scripture, and preached unto him Jesus.
You notice that it is the Spirit which sends Philip to the chariot, it is the Spirit which testifies of Christ, and it is the Spirit that picks Philip up and whisks him away. It is not "some man" as you would like us to believe. It is a man true, but it is a man filled with the Spirit.
"We" are bible believing Christians.
2Pe 1:20 Knowing this first, that no prophecy of the scripture is of any private interpretation.
St. Philip is an apostle, certainly not "some man" and certainly he was filled with the Holy Spirit. This is why you need the apostolic Church to understand the scripture.