The Bible shows that their fathers were angels from heaven.
Satan was busy making trouble.
He was even trying to get God’s angels to be bad.
In time, some of these angels started listening to Satan.
They stopped the work that God had for them to do in heaven.
They came down to earth and made human bodies for themselves.
Why?
The Bible says that it is because these sons of God
saw the pretty women on earth and wanted to live with them.
So they came to earth and married these women.
The Bible says that this was wrong,
because God made the angels to live in heaven.
When the angels and their wives had babies,
these babies were different.
At first they may not have looked different.
But they kept growing bigger and bigger,
and getting stronger and stronger,
until they became giants.
These giants were bad.
And because they were so big and strong,
they would hurt people.
They tried to force everyone to be bad like themselves.
Gen 6:1-8; Jude 6

Jw’s should know this as their jesus was an angel who became a man. So the jw’s would also be nephilim worshippers.