The Catholic Church continues to do what St. Philip did

Protestor: 

The Eunuch only had the prophecy of Isaiah in his hands which words could not be understood without a knowledge of what had happened at Calvary.

That is the point. The Church teaches the ignorant about what happened at Calvary. That is illustrated in this text and continues to be repeated throughout the world to this day. The Catholic Church instructs the world about what happened at Calvary.

(See Acts 8:29 35).

This just repeats the same example I gave. That doesn't at all confirm your claim that is no longer necessary to teach people the meaning of Scripture.
Acts 8:29-35

King James Version (KJV)
²⁹ Then the Spirit said unto Philip, Go near, and join thyself to this chariot.
³⁰ And Philip ran thither to him, and heard him read the prophet Esaias, and said, Understandest thou what thou readest?
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.
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:
³³ In his humiliation his judgment was taken away: and who shall declare his generation? for his life is taken from the earth.
³⁴ And the eunuch answered Philip, and said, I pray thee, of whom speaketh the prophet this? of himself, or of some other man?
³⁵ Then Philip opened his mouth, and began at the same scripture, and preached unto him Jesus.

Protestor: 

Of course, in this formative period when the gospel message had not been fully revealed and the story of the cross had not been told, one would have to be guided to the fulfillment of this dark prophecy to know who it was that "was led like a sheep to slaughter; and just as a lamb dumb before its shearer; so did he not open his mouth." However, now that we have the inspired record of the exact and literal fulfillment of this prophecy, we do not need interpretation to tell us what this means and to explain what the gospel requires of us.

The Catholic Church continues to do what Philip did here. To this day, the Catholic Church teaches the Gospel of Jesus Christ throughout the world.

It is conspicuous by its absence that you posted nothing else about your claims against the Church Fathers.

Sincerely,

De Maria