This is a most relevant and interesting read, discussing the difference between the body and the bride of Christ. Many reborn Christians live in a false sense of security, depending wholly upon OSAS (once saved, always saved). There is more to the Gospel than meets the eye, though. Not all will be taken aside before tribulation, that seems to be the privilege of the Bride only.
After tribulation as explained by Jesus, who is God
“Immediately after the suffering of those days, the sun will be darkened, and the moon will not give its light; the stars will fall from heaven, and the powers of heaven will be shaken. Then the sign of the Son of Man will appear in heaven, and all the tribes of the earth will mourn. They will see the Son of Man arriving on the clouds of heaven with power and great glory. And he will send his angels with a loud trumpet blast, and they will gather his elect from the four winds, from one end of heaven to the other.