What are you Jibbering about?
It is universaly understood cross is a "pagan" symbol too. Considering the majority of early christians are pagan gentiles I don't see why people are suprised.
Technically when they leave they become anti-christ.
(1 John 2:18-21) 18
Young children, it is the last hour, and, just as YOU have heard that antichrist is coming, even now there have come to be many antichrists; from which fact we gain the knowledge that it is the last hour.
19 They went out from us, but they were not of our sort; for if they had been of our sort, they would have remained with us. But [they went out] that it might be shown up that not all are of our sort.
20 And YOU have an anointing from the holy one; all of YOU have knowledge.
21 I write YOU, not because YOU do not know the truth, but because YOU know it, and because no lie originates with the truth.
The Great multitude/ Great Crowd IMO are the damned and the surviors of the end of the world. An anonymous mass of people either way.
(Acts 24:15-16) 15
and I have hope toward God, which hope these [men] themselves also entertain, that there is going to be a resurrection of both the righteous and the unrighteous.
16 In this respect, indeed, I am exercising myself continually to have a consciousness of committing no offense against God and men.
Most of these "revelation" books including ours are really silly. Most christians forget that the bible was writen by Jews. The idea of the afterlife and the concept of judement day did not mature until the time of Jesus. So a big thing for them was the concept of dead actually raising and becoming mortal again. The concept of a spirit world and heaven was a novelty. Look at how heaven is a physical place. How the kindom of God comes down to earth to reside with man. This is too far from the modern concept of heaven to try to reconcile. I mean do you really think most christians think that when they die they will go to live with God on a mountain in the middle east?