I had the great good fortune of partnering with a Jehovah's Witness in Waikiki. We developed a new service department for the Outrigger hotel chain from scratch, installed new equipment in every room, and trained all of their people.
I reckon this took the two of us about three years to complete.
Martin was the most pure hearted, absolutely honest & humble person I have ever known. You could tell from across the room that a different light shown from him.
He was the only Witness I have known, so do not know if he was an exemplar. We never discussed his faith, or mine.
I do not know if Jehovah's Witnesses are Christian. But in practice, Martin was exactly the neighbor Christ wants us all to be.
John 3:18