Consists of three kingdoms: celestial, terrestrial, telestial. This teaching is based on a misinterpretation of 1 Corinthians 15:40-41. Everybody, except for a small handful of people, will go to one of these kingdoms.
Those in the celestial kingdom will live with Heavenly Father and Jesus. A person must have participated (either personally or vicariously) in the temple ordinances to qualify to live here.
Less than faithful Mormons and moral non-Mormons will go to the terrestrial kingdom. They will not live with Jesus, but will be visited by him.
People who don’t repent or confess Christ will be in the telestial kingdom. It is said life there will be thousands of times better than earthly life. They will be visited by the Holy Ghost.
Biblical Christianity teaches that all who go to heaven will live with God for all eternity. It further teaches that Jesus is the only way to heaven (John 14:6) and thus only people who trust in Jesus’ saving work will be in heaven.
The context of 1 Corinthians 15:40-41 clearly shows it is not talking about different heavenly kingdoms. It is an illustration Paul uses to talk about different bodies.