“ The Catholic Church gave you the Scriptures. Both OT and NT.
Seriously??
God gave the Scriptures through Jews .
2/3 before Christ was born.
You mean that an authoritative body of wholly God-inspired writings was established (even if not uniformly) by the time of Christ (who could thus expound "in all the scriptures the things concerning himself" - Luke 24:27), in conformity with those who sat in the seat of Moses?
Impossible! For
"the believer cannot believe in the Bible nor find in it the object of his faith until he has previously made an act of faith in the intermediary authorities..." (Catholic Encyclopedia>Tradition and Living Magisterium)
People cannot discover the contents of revelation by their unaided powers of reason and observation. They have to be told by people who have received in from on high. - Cardinal Avery Dulles, SJ, "Magisterium: Teacher and Guardian of the Faith, p. 72;
Therefore, since one needs faith in Catholicism and instruction by it in order to know what writings are of God, then (to avoid circular reasoning),
when we appeal to the Scriptures for proof of the Church's infallible authority we appeal to them merely as reliable historical sources, and abstract altogether from their inspiration" - Catholic Encyclopedia > Infallibility)
By which appeal the candidate for conversion is sppsd to be able to ascertain that the RCC or the EOC is of God, even though it is impossible for said candidate to know that which God-inspired writings are of God.
However, when and if the candidate finds that distinctive Catholic teachings are not manifest in the only wholly inspired substantive authoritative record of what the NT church believed (which is Scripture, especially Acts thru Revelation. which best shows the NT church understood the OT and gospels), then the argument is made that "we gave you the Scriptures," and thus you need to submit to US.
Which is nothing new:
The officers answered, Never man spake like this man. Then answered them the Pharisees, Are ye also deceived? Have any of the rulers or of the Pharisees believed on him? But this people who knoweth not the law are cursed. (John 7:46-49)
And based upon the Catholic recourse to "we gave you the Scriptures and thus you need to submit to US" then guess who 1st c. souls should have submitted to?