2 Thes 2:15 says
“Therefore, brethren, stand fast; and hold the traditions which you have learned, whether by word, or by our epistle.”
Good enough for me.
THIS!
This is exactly it! The BIBLE teaches us that it is Tradition, not the Bible alone , that we must hold to. Yes, we hold on to the Traditions - BOTH Scripture (Epistle or Letter) and Word! So there were clearly Traditions that were taught by the Church that were NOT in the Letters. Some eventually were incorporated into the New Testament for sure, but the bible itself, tells us to obey the Traditions of word taught by of the Church as well as Traditions in Scripture.
It cant be any clearer! Your friend my twist this verse into all kinds of meanings, but the simple plain reading of this is the Catholic view. The Protestant view is the fallible interpretation of Scripture.
I dont disagree with your assessment that Protestant, some Protestant , traditions are very good a focusing on a relationship with Christ. That is good! I dont know if it makes rock bands in Church valid, but thats another issue! But, it is simply a sad fact that most Catholics who leave the Church with the experience you point out - see Tradition as a barrier- simply NEVER bothered to try to understand! They had a responsibility to try to understand! But the fact is that EVERY Tradition that seemed to be a barrier to the exCatholic is actually just a path TO Christ! They are not an end in themselves! The Rosary, Confession, Mary, etc, ALL lead to Christ! They help us deepen our relationship with Him ! They are no different than the myriad of Protestant Harvest Festivals, devotions, books, speakers! The only difference is that the Catholic Church doesnt reinvent the wheel every generation. Once we find a good devotion , such as the Rosary or the Divine Mercy , we pass it on from one generation to the next. That may have the risk of going stale or losing meaning and becoming a barrier. But that is NOT an inherent problem with the devotion. The tradition is not the barrier! The barrier is the lack of understanding and wrong thinking without investigating and asking questions!
Im not saying that is the case with every ex Catholic. Some have very honest and sound theological reasons for leaving. Im not saying they are right, but at least their arguments are cogent, intellectual and took some investigation! But that is NOT the situation for most ex Catholics. Studies prove it! The vast majority, studies show, of converts out of the Church were due to the conversion experience you alluded to. They dont necessarily have a great grasp of the Catholic faith, a friend invites them to their Church, challenges them on some basic ideas for which they are not able to respond, and then have a real encounter with Christ at the Protestant church. That is M.O. Evangelicals have had for a few decades now. Its not working as well lately because the internet provides very easy access to the truth. And now more Protestants are realizing the lies theyve been fed for years about Catholicism. One of those lies is that Tradition is nothing but man made rules. The fact is that the bible demonstrates that there are Traditions taught by the Church that are not necessarily in the bible . And these Traditions are all intended to bring us to Christ just as any Harvest Festival, or Tent Revival intends to do!