You mean a medieval monk like Martin Luther? You know the monk you came up with this idea of "sola scriptura" which CANNOT be found in the Bible or in ANY Church writings up to this point.
Transubstantiation may have been first DEFINED much later, but that doesn't mean that nobody believed it. There is complete Biblical support for the Real Presence and ZERO support opposing it.
But I'm curious, why are the writings of a medieval monk that YOU believe more valid than the writings of a medieval monk that WE believe? And I am fairly certain that Catholics agree with far more of Martin Luther's writings than non-Lutheran Protestants do. If you don't believe me, consider the FACT that Luther accepted the Real Presence (though his belief differed slightly from transubstantiation), he considered the Blessed Virgin Mary to be ever virgin and the Mother of God (he uses this phrase in the 95 Theses), and the 95 Theses acknowledge that St. Peter was the Pope.
“...unless those traditions align with scripture”
A rather important caveat...
Using scripture for authority is extremely well taught in scripture. Jesus on the road to Emmaus, Paul and the Bereans, the writer of 2 Peter...the NT writers quote the OT nearly 300 times as authoritative.
Yet you claim it is made up?