Concerning the rapture of the Manchild children, the Book of Revelation shows that part of the Church is left behind.

.............We are told that the Woman and a "remnant of her seed" are still on earth.

...................Revelation 12:17
"And the dragon was wroth with the woman, and went to make war with the remnant of her seed, which keep the commandments of God, and have the testimony of Jesus Christ."