The rapture is considered controversial in some areas of the Church but I really believe that if all Scriptures are looked at carefully and christians understand that the great tribulation is not about the church but Israel and the unbelieving world, then everything fits perfectly into place. The Church is in Heaven at the beginning of Revelation 4 and comes back to earth with the Lord Jesus at the end of the great tribulation period in Revelation 19. This is an area where christians can respectfully agree to disagree without breaking fellowship with one another.