Question: Do you think Jews and Jehovah's Witnesses will go to heaven, why or why not?

Answer: It's not what I think that matters, it's what the Bible says...

Let it be known to you all, and to all the people of Israel, that by the name of Jesus Christ of Nazareth, whom you crucified, whom God raised from the dead, by Him this man stands here before you whole. This is the 'stone which was rejected by you builders, which has become the chief cornerstone.' Nor is there salvation in any other, for there is no other name under heaven given among men by which we must be saved." (Acts 4:10-12, NKJ)

So will some Jews go to heaven? Yes, but only those who have put their faith in Jesus Christ as Lord and Savior. (These Jewish believers are sometimes known today as Messianic Jews). There needs to be a separation between Jews (who are so by birth) and those whose faith is Judaism. Judaism does not believe that the Messiah (Christ) has come and they are still are waiting for a Savior. For this reason they have rejected Jesus Christ and cannot be saved (i.e. go to heaven). This Jew (Paul), who wrote the following, is one that has gone to heaven.

I say then, has God cast away His people (the Jews)? Certainly not! For I also am an Israelite, of the seed of Abraham, of the tribe of Benjamin. God has not cast away His people whom He foreknew. Or do you not know what the Scripture says of Elijah, how he pleads with God against Israel, saying, "Lord, they have killed Your prophets and torn down Your altars, and I alone am left, and they seek my life"? But what does the divine response say to him? "I have reserved for Myself seven thousand men who have not bowed the knee to Baal." Even so then, at this present time there is a remnant according to the election of grace. (Romans 11:1-5, NKJ)

Salvation is found only through placing your faith and trust in Jesus Christ alone -- not by works -- nor can it ever be found by following after a Jesus other than the one revealed in Scriptures. The Jesus of Scriptures is fully God, fully man, sinless, eternally part of the one true God -- who is forever Father, Son and Holy Spirit. His sacrifice on the cross was the perfect and complete payment for the sins of mankind.

For by grace you have been saved through faith, and that not of yourselves; it is the gift of God, not of works, lest anyone should boast. (Ephesians 2:8-9, NKJ)

Not with the blood of goats and calves, but with His own blood He (Jesus) entered the Most Holy Place once for all, having obtained eternal redemption. (Hebrews 9:12, NKJ)

Those who follow after another Jesus (and there is no other Jesus) cannot be saved. Jehovah's Witnesses follow a Jesus who was merely a man (not God) and practice a religion whose emphasis is works towards salvation. When anyone says that you have to work toward your salvation, they are saying that what Jesus did on the cross was not enough. Ultimately you are told to trust in Jesus and yourself (the works you need to do). Other cults, like the Mormons, also teach a "gospel" that is based on works plus faith and even the Mormons worship another Jesus, one who is a separate God from God the Father (one of many Gods or so they would say). Each of these cults have found it necessary to add other books to the Bible, or alter passages of the Bible, to make it say what they want. Coming to God requires a right knowledge of who He is (see Hebrews 11:6) -- and only the Bible alone can provide this (see 2 Timothy 3:16-17).

Jesus answered and said to them, "Are you not therefore mistaken, because you do not know the Scriptures nor the power of God? (Mark 12:24, NKJ)

But I fear, lest somehow, as the serpent deceived Eve by his craftiness, so your minds may be corrupted from the simplicity that is in Christ. For if he who comes preaches another Jesus whom we have not preached, or if you receive a different spirit which you have not received, or a different gospel which you have not accepted-- you may well put up with it! (2 Corinthians 11:3-4, NKJ)

Can Jehovah's Witnesses and Mormons go to heaven? Not without repenting of their sin and placing their faith and trust in Jesus Christ. And then they will not longer be Jehovah's Witnesses or Mormons -- but Christians.

Jesus answered, "I am the way and the truth and the life. No one comes to the Father except through me. (John 14:6, NIV)