What I mean is, is it possible for a Christian or a group of Christians to misunderstand the NT as a whole or in part? If the answer is yes, what standard do Christians use to determine if they are understanding the NT correctly?
For example, JW beleifs about Jesus vs. Catholic beleifs about Jesus. Both groups use the NT and both have ideas about Jesus that contradict each other. How does an outsider, a non JW and non Catholic, determine which group got it right? What is the standard used?
I don't agree with people who say the KJV is better than the NIV I think it doesn't make much of a difference.
They determine which is right by searching the scriptures. Bible Gateway passage: Acts 17:10-34 - Holman Christian Standard Bible