I have attached a document in regards to the KJV Bible, its history, its accuracy, importance, and so on. In comparison to the NIV Bible, this is the best biblical translation. The Biblical scholars who translated it between 1604 to 1611 from Hebrew, Greek, and Aramaic had directly translated it word for word, making it the most accurate Bible translation out of all the versions today. The NIV bible (translated in 1978) is translated from the KJV bible "Thought for Thought", and there were some bias & prejudices from its translators. Below are some scriptures that are in the KJV version, but missing from the NIV Bible:
The bible tells us that: "All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:  That the man of God may be perfect, throughly furnished unto all good works" - 2 Timothy 16-17.
So don't let anyone try to trick you in saying that the NIV is more clear, or a better translation, or more beautiful.
God bless you - and stay encouraged.