Both cannot be true. Answer it so we can move on. Is Sunday worship biblical or is it a witness to the binding and loosing power of the church at Rome? Without an answer to this, I have no reference in which to continue the debate. This guysseems to be able to answer it, why can't you?
"You may read the Bible from Genesis to Revelation, and you will not find a single line authorizing the sanctification of Sunday. The Scriptures enforce the religious observance of Saturday, a day which we never sanctify." Cardinal Gibbons (for many years head of the Catholic Church in America), The Faith of Our Fathers (92d ed., rev.; Baltimore: John Murphy Company), p.89.
You just stated the false dilemma yourself!
The "binding and loosing power of the church" is declared, taught, and defined ... where ... in Scripture! You're apparently trying to claim that the application of an authority given the apostles and their successors by Christ himself which grant is itself recorded in the Bible !!! is unbiblical !?!?
Is the book of Deuteronomy Biblical? I ask because most of it is legislation defined by Moses (who isn't God, remember) for the children of Israel, wherein Moses acts by authority delegated him by God. What is the difference between that, and the Apostles legislating for the church of God according to the authority given them in Christ?
Let me ask you a question. Do you keep kosher? Why not? Who told you that you didn't need to? "It's in the Bible, in Acts," you respond. Very well, do you believe it because it's written down in Acts, or do you believe it because the Apostolic church did it, whether or not it's in Acts? And if you believe it only because it's written down in Acts, then who told you that Acts belongs in the Bible?