I feel exactly the same way you do...
Reading the Holy Scripture with the guidance of the Catholic church will definately be harmful to the reader...
I'm not trying to be caustic, or abrasive...I firmly believe that...
You are entitled to your religious preference. However, consider this. It is true that when the scripture was written it was not meant to be a scholarly text. On the other hand, it was meant to be read in a church setting, and, naturally, commented upon by the reader and other people of authority. This is how the Jewish worship was organized, and it is a natural way to go about it in a society where few could read. So, scholarly or not, it was meant to be read by someone also capable of commenting on it. The early record of the church worship confirms that (St. Justin Martyr's Apology comes to mind, where it is described how the congregation would listen to the Gospel readings after the Eucharist).
Now, that was when patristic Greek was the common language. There was no linguistic barrier or a cultural barrier. Things changed since then. It is true that the basic Christian message can be picked up from reading the Christian scripture, but when finer points of theology come into play, -- like, What to think about our physical flesh? -- you need to see what the early church Fathers thought about the scripture, because that gives you the linguistic and historical context. This is not the matter of Catholic authority, it is a plain ruile of how any historical document is to be read: in its linguistic, cultural and historical context. The Church provides the context.
If you don't want to agree with the Catholic (or Orthodox) Church on the veneration of relics, fine, -- it's a free country. But don't fool yourself thinking that in the 2000 years of Church history you are the first one who reads these verses that you cite and relates them to the veneration of relics critically.