You offer the twin fallacies of error of fact and of bifurcation (all or nothing). We know a great deal about the original autographs (original writings) from the manuscript (hand-written copies) evidence left that attest to them. In fact, we know a great deal more today about the original texts than did the scholars who assembled the RT, as we now have a lot more textual evidence to use in a comparative fashion. The current state of affairs in textual criticism (science for identifying the original text) indicates that we know within about 99+ percent the exact wording of the original texts. It is that surety that is driving modern textual translation efforts -- and being resisted by those who prefer the efforts of scholars who were highly motivated by theological issues from a bygone era.
In order to hold your point that "no one knows if our current texts are better or more accurate because no one knows the originals," you would simply have to walk away from the Bible as an authoritarian piece of literature, otherwise known by faith and experience as The Word of God. I doubt that you are willing to carry your point that far... Or if so, then you are no longer arguing as a Christian.
For curiosity sake, are you capable of working in the original languages?