The JWs do not use a real Bible. They use a bible written ENTIRELY to support their cult views.
Further, the Bible is the servant of the Watchtower, and not the other way around. The JWs self reference in all matters regarding biblical doctrine.
The JWs do not believe that Jesus is part of the godhead. They believe he is the angel Michael. That isn't even the tip of the iceberg.
There are many corrupt Bible translations. I would like all to use the most reliable KJV but many choose to use the newer NIV which is similar to the JW's NWT.
They may be in error about the Godhead. I have debated with at least one who said Jesus is not God. They are wrong about this. However what you say here about Michael being an angel is also error. ALL the Christians before the year 1900 understood Michael was the preincarnate Jesus. The Jews understood this was God also. Look at all the Bible commentaries from the 19th century and earlier and this is what is found. So it is only modern Christianity who has forgotten this Bible truth. Jesus returns with the shout of the archangel as he is chief of the angels. Michael is just one of his names. Michael is not an angel rather the archangel or chief of the angels who is God.
Anyway, you wont find the word 'cult' in the Bible. It is just a papal claim like the 'heretic' before. Heretic is in the Bible. This is why all the books on cults never include the biggest one in Rome.