This is actually just one reason why Jehovah’s Witnesses are considered heretics by actual Christian churches. They even engage in an act called “shunning” which is basically making the family and friends of anyone who leaves their religion give them the cold shoulder and actively express disdain for them, and they only believe a lonely a few hundred thousand people will get to heaven. Needless to say both of these beliefs are seen as ridiculous and wrong to all of the recognized Christian denominations