At this time, when a child of God dies, their immaterial side (their soul and spirit) immediately goes to be with the Lord in heaven. (2 Corinthians 5:8)

At a future date in time, just prior to the time of tribulation spoken of in the New Testament book of Revelation, Christians who have died will be resurrected from the grave and their bodies, souls, and spirits, will once more be re-united. This will take place in the time it takes an eye to blink or twinkle.

At that time both those who are resurrected and Christians who are alive will be physically changed. They will receive glorified bodies that will never more grow old, get sick, or die. Also, at that time, they will be taken to heaven to be with the Lord Christ Jesus. This event is referred to as the rapture of the Christian Church. (1 Thessalonians 4:13-17; 1Corinthians 15)

Following the rapture, the world will go through a time of tribulation for 7 years.  At the end of this period, Christ Jesus, along with the Christian Church and holy angels, will descend upon the earth, the battle of Armageddon will take place, the nations will be judged, and those who came to a saving faith in Christ Jesus during the tribulation (and other righteous dead) will be resurrected. This will usher in a period known as the Millennium (the 1000 year reign of Christ Jesus upon this earth).