I believe that the AV Bible is the written word of God to the English speaking people of the earth.
I know it is the word of God because it is accurate.
I know that any new book isn't part of the AV Bible because the AV Bible testifies that it is a completed book. As such no one is authorized to change it's words nor add to them.
I would know regardless because lies always contradict the truth. And, knowledge of the truth exposes lies. Thus, anything contrary to the AV Bible is false. Or, the AV Bible isn't the word of God.
Furthermore, as a Christian I have a unction in my inner man that guides me into all truth.
If I lack knowledge then as a Christian I must rely on the teachers who God approves to help me.
The Holy Spirit, the AV Bible, my own spirit and the testimony of others all work toward affirming my belief's.
Joman.