Well, even the various Christian denominations have differences among themselves. But if you wish to know the MAIN differences between the JW"s and the mainstream then:
- They deny the Trinity
- They deny Hellfire
- They deny the Immortal soul
True, because none of these are biblical teachings...all originated from paganism....yet they are held by almost all of Christendom.
- They believe only 144,000 go to heaven
Yes, because that is the number seen in heaven with Jesus...
"Then I saw, and look! the Lamb standing on Mount Zion, and with him 144,000 who have his name and the name of his Father written on their foreheads. . . .And they are singing what seems to be a new song before the throne. . . . and no one was able to master that song except the 144,000, who have been bought from the earth. . . . .These were bought from among mankind as firstfruits to God and to the Lamb, 5 and no deceit was found in their mouths; they are without blemish." (Rev 14:1-5)
They will rule with Jesus as "kings and priests" in his Kingdom....they are chosen as Spiritual Israel, not fleshly Israel. (Gal 6:16)
- They believe in a restored paradise earth
Yes, because that was God's first purpose to have a sinless race of humans to care for his material creation. This was their original assignment...to
"fill the earth and subdue it." God never said it was to be a training ground for heaven.
- They believe all those who have been judged by God in the past, and those who reject their message today will perish at Armageddon. So they don't give much hope for the world of mankind.
Anyone who has been judged by God as unworthy of life will not return in the resurrection. (Like the Pharisees whom Jesus consigned to "gehenna"......unlike "hades" it is a place of no return) But Jehovah is the one who determines who is in "hades" and who is in "gehenna".....neither of which has anything to do with Christendom's "hell'. Gehenna is eternal death, which is the opposite of eternal life.
- While they will not admit it publicly, they believe ONLY faithful JW's will inherit the earth.
Not so....all of the pre-Christian servants of God will "inherit the earth" along with those who survive Armageddon. No one was ever promised heaven in the OT. The Jews believed in resurrection not immortality of the soul.
Those "saved" at the judgement will be those whose hearts are obedient to Christ's teachings.
Those who teach things that Christ never did, will be doubly reprehensible, like the Pharisees as Jesus said....
“Woe to you, scribes and Pharisees, hypocrites! because you shut up the Kingdom of the heavens before men; for you yourselves do not go in, neither do you permit those on their way in to go in. . . .
15 “Woe to you, scribes and Pharisees, hypocrites! because you travel over sea and dry land to make one proselyte, and when he becomes one, you make him a subject for Ge·henʹna twice as much so as yourselves."
Those who listen to the wrong teachers will end up in the same place as they do....complacency is a dangerous thing. We should question everything.
- The vast majority of JW's are not spirit begotten.
True, because only the 'spirit begotten' ones will inherit immortality in heaven as spirit beings, "born again" in a spirit body that will enable them to dwell in heaven with Jesus. Only 144,000 are spirit anointed as a token of their "heavenly calling." (Heb 3:1)
As 'kings and priests', (Rev 20:6) their subjects will be on earth. (Rev 21:2-4)
Their Governing Body, made up of the anointed (those who will go to heaven) speak for God and to disagree with them is to disagree with God.
That is a bit twisted....our brothers on the governing body are spirit anointed Christians who are appointed to lead us into the new world that we are awaiting. (2 Peter 3:13) They are not our masters but our shepherds, who serve the same master as we do...Jesus Christ.
It was Jesus who promised to be "with" those he commissioned to take "the good news of the Kingdom" out into the "entire inhabited earth for a witness to all the nations" before he brings the curtain down on this wicked world. (Matt24:14; Matt 28:19-20)
As far as I can see no one has taken up the challenge to "preach the good news of the kingdom" as Jesus said it should be done....except Jehovah's Witnesses.
Matt 10:11-14 tells us that the disciples were sent out in their local areas to take the message to their neighbors in the towns and villages nearby. When was the last time a "Christian" from any church called on you with the good news of God's Kingdom?
Christendom has no real idea of what it actually is.....their message is anything but cohesive.
They deny the physical return of Jesus to earth, believe that he returned invisibly in 1914
Where did Jesus say that his return would be visible? He told his apostles that a "sign" was needed in world events to identify the time of his "parousia"(Matt 24:3-14 which is his "presence")....his "coming" as judge is at the end of the last days in which we are now living, and all the signs that Jesus gave have all been in evidence since 1914. We believe that the end is very close.
If you wish

.....there are many more differences....and if you know the parable of the "wheat and the weeds" you will see clearly why Jesus gave it. The "weeds" of counterfeit Christianity sown by the devil, took over the whole field....(Matt 13:24-30; 36-42)
The preaching work that the JW's do is to gather as many as possible into Jehovah's Spiritual Ark Those who reject their message will perish in the flood of Armageddon.
Matt 24:37-39...
"For just as the days of Noah were, so the presence of the Son of man will be. 38 For as they were in those days before the Flood, eating and drinking, men marrying and women being given in marriage, until the day that Noah entered into the ark, 39 and they took no note until the Flood came and swept them all away, so the presence of the Son of man will be.
And here we are....