This is like saying that the Trinity did not “appear” until it was defined by the councils. The fact that certain words such as Trinity do not appear in Scripture, or are not articulated for centuries does not equate to the concepts being non-aposotlic. If that were true, you would have to throw out the whole NT, because it was not defined until the fourth century.
I think there is some truth to this. The Teaching of Jesus was whole and entire in the Church before a word of the NT was written. That is why the Catholic Church is not
“bible based”. The Catholic Church produced the NT,and it reflects what the Church believes and teaches. However, the Reformers found it necessary to reject the Church founded upon the Person of Jesus, and replace it with a Church founded upon their re-interpretations of the Scriptures. That was the best way to dispense of the authority appointed by Christ (make the “chair of Peter think fall apart”). Once the authority appointed by Christ is abrogated, anyone reading the Scripture can then derive their own “true understanding of the meaning” as you say.
However, this practice does not change the Truth. Jesus only founded One Church, and He only commissioned on person to feed and care for the flock. Only those in union with that person appointed by Christ are in unity with the Church He founded. Re-interpreting the scripture to suit one’s own desires does not change that.
It is an error to think that man can determine “what is required for salvation”.This is the perogative of God, and has already been decided by Him. He committed these requirements to the Church, and they have been held (by the power of the HS) from that day until this. Protestants seem to desire a “readers digest” version of salvation, and delight in various denominations to determine for themselves what minimum requirements must be met to be “saved” rather than accepting what God has revealed. It reminds me of the sacrifices of Cain and Abel. Cain wanted to invent his own method of pleasing God, apart from what God had revealed.
Your statement about the doctrines of Mary “having nothing to do with Christ” only reveal your ignorance of your own family history. All the doctrines about Mary are derived from the development of the doctrines about Christ to refute heresy. If yuou deny them, then you deny the Apostolic teaching on the nature of Christ.