in the old testament god is invisible or no one can see the face of god and live. Yet god seems to deal with people in some form of manifestation. Now that being the angel of the lord or word of the lord.
Now looking into the new testament its pretty obvious the writers believed jesus was this old testament manifestation of god.
Now how this becomes the trinity, i dont know but jehovah witnesses have no right to be critical. They dont even understand basic christology.