Yahweh was not dictating every single word to Moses. He was anointed and therefore got a better disposition to do the right things and to make sound judgments. (Without knocking out his own will off course as his water out of rock mistake shows).
Jesus was sticking closely to his father because his mission was of such great importance. He was anointed too.
This anointing with holy spirit also opens the way to perform the works of the spirit to Christians. You become a new creation thereby. (again without knocking out your free will, but rather giving you the freedom to chose the right actions rather than the wrong ones. Those in the flesh mainly dont have this free choice, as they cant overcome the fleshly adamic spirit inherent to depraved mankind)
Sticking with anointed sisters and brothers of Christ is the right thing to do, while being on the way of becoming adopted by father into this new life. At no point there is coercion. Its just gaining the ability to perform the things prepared for the holy ones.
Whoever bears the fruit is connected to Jesus. Some JW are children of God, as well as some in other denominations. I have seen some here and some there.
I personally would switch to the argument that the different kind of Good News preached by the WT (Gal 1) puts them outside of the true flock of Jesus Christ. Matth 23 seems applicable. Being false prophets also invalidates their claim of authority. There is lots more.
God bless