I have heard this one before. Nicea simply accepted what was already considered canonical by Christians at the time. Popular use, not Nicea, made the decision. To answer your other questions let’s examine some Scriptures together and then I’ll make a few remarks.
1 Corinthians 2:15 (English Standard Version)
15 The spiritual person judges all things, but is himself to be judged by no one.
As all true Christians are spiritual people, they have the right to judge whether an interpretation is correct or not. Further, they have a responsibility in the discovery of the meaning. He must seek out the intended meaning of the author. He goes about this by using good reliable tools. Witnesses have come to believes the study tools of the WTBTS are just that, reliable. This is not to say that Bible study tools outside of us are not reliable. There are many fine Bible dictionaries, Bible handbooks, word study books, encyclopedias, and so on. However, most do contain theological bias. But of course, you would argue that ours does as well. Therefore, we have to determine for ourselves, who is right and who is wrong, and Jehovah will sort it out in the end.
2 Peter 1:20 (English Standard Version)
20 knowing this first of all, that no prophecy of Scripture comes from someone’s own interpretation.
The right of all spiritual Christians to interpret Scripture does not mean private interpretation is the established meaning for the true Christian community. This is known as Reader Response. This is where you hear “I think this means,” “I believe this means,” “this means to me,” and “I feel this means to me.” The problem with this is that the text loses its authority; God and His authors lose their authority over the intended meaning of the text. When God inspired the writer, to express His will and purposes, there was the intention of one meaning, what the author under inspiration meant by the words he used. If anyone can come along and give it whatever interpretation pleases them, then God’s authority over the meaning is lost, and there is no real meaning at all. Jehovah God has always charged some with the administration of His Word. In the time of Abraham, the Patriarchs. In the time of the Exodus, Moses and the seventy. In the time of the kings, prophets and priests. In the time of the first century Christians, the body of older men in Jerusalem.
You will note that in many cases, it involved His choosing one outstanding person of faith, who then built upon that: Abraham, Moses, Samuel, Elijah, Elisha, Ezra and Nehemiah, Peter, Paul and John. You will also notice that it went well when God’s people followed the lead of these ones that were selected. When they did not follow their lead, it did not go so well. We accept Charles Taze Russell as being a person of outstanding faith, who was chosen by God. We do this just as the followers of Luther chose him, just as the followers of Calvin followed him, just as the followers of Arminius followed him, bringing about Lutherans, Calvinists, and Arminians. However, we believe the good fruit is reflective of the identity of which person is reflective of a spiritual person, a person of outstanding faith. We believe our history is imperfect, but if sat beside the others, we have scratches in our organizations, while the others are damaged beyond repair, totaled.
1 John 4:1 (English Standard Version)
1 Beloved, do not believe every spirit, but test the spirits to see whether they are from God, for many false prophets have gone out into the world.
This text is quite clear that each spiritual Christian has the obligation to test anything that gives the appearance of being contrary to Scripture. This is exactly what Charles Taze Russell did, and found them wanting: hellfire, Trinity, immortal soul, purgatory, etc.
Acts 17:11 (English Standard Version)
11 Now these Jews were more noble than those in Thessalonica; they received the word with all eagerness, examining the Scriptures daily to see if these things were so.
We have kept the primary doctrines that Russell established with the original Bible Students. Some we have tweaked, because we have followed the advice of Acts 17:11. As the research teams have grown in knowledge of the original languages, manuscripts, history and so on, they have had to humbly make adjustments. But again, they have kept almost all of the basic core findings of Russell and the International Bible Students as they were called at that time.
Nick, who decided what constitutes Sacred Scripture, namely, the New Testament, that you are quoting from? I have news for you, it was an “organization” other than the WTBS. Think about the implications of that.
I’ll ask you what I’ve asked many other JW’s that come on this site and have refused to answer. From where did Charles Taze Russell receive the authority to interpret scripture?