You're "playing Peter against Paul"... almost literally. Taking one verse (or even a few) as the standard and claiming another apparently-contradictory verse is therefore false is not a sound argument. You will need additional evidence to support your claim that Matthew 28:19 has been changed.
You will also need to supply evidence supporting your assertion that the Council in question consisted of "Catholic priests". Even that by itself is not evidence of tampering.
The Catholics claim to have kept an encyclopedia of everything they done throughout their history. Here is some of what their encyclopedia claims:
1.
The Catholic Encyclopedia, II, page 263:
"The baptismal formula
was changed from the name of Jesus Christ to the words Father, Son, and Holy Spirit by the Catholic Church in the second century."
This particular man making the same claim went on to become Pope:
2. Catholic Cardinal Joseph Ratzinger:
He even states the trinity is a COMPLETE FABRICATION:
The Trinity baptism and text of Matthew 28:19 therefore did not originate from the original Church that started in Jerusalem around AD 33. It was rather as the evidence proves a later invention of Roman Catholicism completely fabricated. Very few know about these historical facts.
3.
"The Demonstratio Evangelica" by Eusebius:
Eusebius was the Church historian and Bishop of Caesarea. Eusebius informs us of Jesus' actual words to his disciples in the original text of Matthew 28:19: "With one word and voice He said to His disciples:
"Go, and make disciples of all nations in My Name, teaching them to observe all things whatsover I have commanded you." That "Name" is Jesus.
4.
New Revised Standard Version says this about Matthew 28:19:
"Modern critics claim this formula is falsely ascribed to Jesus and that it represents
later (Catholic) church
tradition, for
nowhere in the book of Acts (or any other book of the Bible) is baptism performed with the name of the Trinity..."
Here is the second reference to Book of Acts baptizinf in NAME of Jesus concluding the trinity formula is false:
5.
The Jerusalem Bible, a scholarly Catholic work, states:
"It may be that this formula, (Triune Matthew 28:19) so far as the fullness of its expression is concerned, is a reflection of the (Man-made) liturgical usage
established later in the primitive (Catholic) community. It will be remembered that Acts speaks of baptizing "in the name of Jesus,"..."
this claims the trinity formula is FOREIGN to Jesus (as in He would never say such garbage):
6.
The International Standard Bible Encyclopedia, Vol. 4, page 2637, Under "Baptism," says:
"
Matthew 28:19 in particular only canonizes
a later ecclesiastical situation, that its universalism is
contrary to the facts of early Christian history, and its
Trinitarian formula (is) foreign to the mouth of Jesus."
This makes the claim that Jesus did not say the trinity formula:
7.
The Tyndale New Testament Commentaries, I, 275:
"It is often affirmed that the words in the name of the Father, and of the Son, and of the Holy Ghost are not the ipsissima verba [exact words] of Jesus, but...
a later liturgical addition.
More claims that the Catholic church bastardized scripture:
8.
Edmund Schlink, The Doctrine of Baptism, page 28:
"The baptismal command in its Matthew 28:19 form can not be the historical origin of Christian baptism. At the very least, it must be assumed that the text has been transmitted in a form
expanded by the [Catholic] church."
IF YOU LIKE, THERE ARE MANY MORE I COULD COPY/PASTE FOR YA