JWs are a mind controlled group. Their leaders direct just about every part of their thinking. They believe the Bible is inspired by God and they are the only ones who have the truth from it. They are taught that everyone who is not a JW will be destroyed yet many will not admit that belief. They also believe that if anybody who is baptized as a JW and disagrees with the "basic teachings of Jehovah's Witnesses" will be disfellowshipped (shunned by the members). They also believe that those in the faith should only marry others in the faith though they can't fully enforce that it's looked down upon. Jehovah's Witnesses believe that their leaders are the only channel to God.
They don't celebrate holidays, birthdays, national days or any other day the world might celebrate. They are taught not to encourage their children to go to college to pursue a high paying career.
There's more I just can't think of it all right now. Maybe someone else can add to this.
Ask him if he's willing to give up the stupid religion for you and if he hedges, make a mad dash for the door and get out.