Fish-Hunter
Rejoice in the Lord!
My understanding is that when the NT refers to scriptures, it is referring to the OT.
The Bible calls for us to "hold fast to the traditions which you have been taught, whether by word or epistle."(2 Thessalonian 2:15) and calls the Church "the pillar and ground of the truth"(1 Timothy 3:15)
Secondly, the Biblical canon itself is an extra-Biblical tradition.
That said, there has not been in my experience any difference in the Gospel preached at protestant worship and at Catholic Mass.
Thanks for the posting. If you think about both communities, both Rome and Historical Protestants use Paul's anathema found in Galatians 1, accusing the other community for preaching a different gospel. The Council of Trent of Rome added numerous anathemas condemning the Protestant gospel.
Roman Catholicism - Council of Trent council of trent - Google Search
Protestantism - Historical Protestant Confessions such as the WCF and LBC 1689.
The main point of the Protestant Reformation is the recovery of the biblical gospel of grace through faith. The solas are essential gospel issues. The Catholic Eucharist and other Roman Catholic sacraments are essential to the Roman Catholic gospel. If you say that there is no difference in a Protestant worship service and a Catholic Mass, you have implied that the Protestant Reformation was not a work of God, but of the enemy. Could you please share what you believe were the central issues of the Protestant Reformation.
Historic Church Documents at Reformed.org
The link above is my understanding of the central issues of the Protestant Reformation.