Jesus Christ, the son of the Most High God, Jehovah has this to say: "If the world hates you, you know that it has hated me before it hated you. If you were part of the world, the world would be fond of what is its own. Now because you are no part of the world, but I have chosen you out of the world, for this reason the world hates you. Keep in mind the word I said to you: A slave is not greater than his master. If they have persecuted me, they will also persecute you; if they have observed my word, they will also observe yours." - John 15:18-20
The inference I draw from the Holy Scriptures quoted above is that Jehovah's Witnesses are opposed because they actually have God's and Christ's endorsement and approval.