The point is that the way for us to be saved now (1 Corinthians 15:1-4, Gospel of Salvation) will not be the same for those in the tribulation.

Revelation 1:5 And from Jesus Christ, who is the faithful witness, and the first begotten of the dead, and the prince of the kings of the earth. Unto him that loved us, and washed us from our sins in his own blood,

^^Jesus washed us through faith in His atoning sacrifice


Revelation 7:14 And I said unto him, Sir, thou knowest. And he said to me, These are they which came out of great tribulation, and have washed their robes, and made them white in the blood of the Lamb.

^^Tribulation saints did works + have faith, and washed their own robes.

Revelation 14:6 And I saw another angel fly in the midst of heaven, having the everlasting gospel to preach unto them that dwell on the earth, and to every nation, and kindred, and tongue, and people,

7 Saying with a loud voice, Fear God, and give glory to him; for the hour of his judgment is come: and worship him that made heaven, and earth, and the sea, and the fountains of waters.

1. Tribulation saints must fear God for salvation
2. Tribulation saints must give God glory for salvation
3. Tribulation saints must worship God for salvation

Tribulation saints must also NOT take the mark for salvation. These are all works, in addition to having faith in God.

See the difference? If you believe the angel in Revelation 14 who preaches the everlasting gospel is from God, then Paul must have been wrong in Galatians 1 when he said any man or angel who preaches another gospel would be accursed. Then you are denying Scripture, and have a host of other problems.

Rightly divide the Word of Truth