The Great Crowd must attain perfection during the millennial kingdom
According to the Watchtower, members of the great crowd must try to prove worthy of everlasting life by attaining perfection during the millennial kingdom.
If they prove worthy at the conclusion of this “old system,” they will enter the millennial kingdom on earth, either by surviving Armageddon or by being resurrected (re-created) from the dead in physical bodies. They will start with a clean slate. Their past sins will not be held against them.[1]
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In Romans 10:1-3, Paul reveals something regarding his fellow Israelites which I believe applies equally to Jehovah’s Witnesses. “Brothers,” Paul says, “my heart’s desire and prayer to God for the Israelites is that they may be saved. For I can testify about them that they are zealous for God, but their zeal is not based on knowledge. Since they did not know the righteousness that comes from God and sought to establish their own, they did not submit to God’s righteousness.”
Because of the Watchtower teaching that only the anointed 144,000 are in the new covenant, at their annual Memorial service (their version of communion) only those who profess to be in this special class are allowed to partake of the bread and wine. Others are encouraged to attend, but they are required to pass the bread and wine by. This includes all Jehovah’s Witnesses who are in the great crowd, because the Watchtower says that the new covenant in Christ’s blood is not for them.
The Watchtower teaches a two-class salvation system. It says there’s a “little flock” (Luke 12:32) of 144,000 anointed Christians who will be resurrected in spirit form and rule with Jesus from heaven. These are the ones who are “born again.” Then there’s the great crowd of “other sheep.” They don’t need to be born again. They will never go to heaven but instead will live forever in paradise on earth.
Most Jehovah’s Witnesses are unaware that the Watchtower used to teach as truth a 4-class salvation system – two classes on earth and two classes in heaven. Under this system, the Watchtower taught that both the 144,000 and the “great crowd” would be in heaven. 
