When Jesus returns, in Revelation 19:20, the beast-king and the false prophet will be cast alive into the lake of fire.
Differently, Satan, in Revelation 20:1-3, will be cast into the bottomless pit.
So the coming false-Christ, i.e. the Antichrist, cannot be Satan.
the little horn/prince that shall come/Antichrist/revealed man of sin/beast-king person will be an actual Jew.
That above is irrelevant. Because ONLY Satan and his angels so far have already been judged and sentenced to perdition in the "lake of fire", and that means NO flesh-born man has been sentenced to perish yet, because that Judgment Seat by Jesus Christ does not happen until AFTER His future return per Revelation 20:11-15. So if you think today flesh-born peoples have already been judged and sentenced to perish in the future "lake of fire", then you and I do not worship the same God.
What then does that mean who the "false prophet" and "beast" of Revelation 19:20 are?
It means those are only ROLES that Satan himself will play, and that is why those 2 ROLES are destroyed on the day of Christ's coming but Satan himself is not destroyed yet. That word "beast" can refer to either the beast kingdom of ten horns, seven heads, and ten crowns of Rev.13:1, or to the beast 'king' idea of Rev.17. In Revelation 13:11 with the "another beast", that is Satan as that one who speaks as a "dragon".
I don't know how you figure that it can't be Satan when God's Word is pointing directly to... Satan by that "dragon" reference. Want another example from God's Word? Here...
Rev 12:17
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.
KJV
And this...
Dan 7:20-22
20 And of the ten horns that were in his head, and of the other which came up, and before whom three fell; even of that horn that had eyes, and a mouth that spake very great things, whose look was more stout than his fellows.
21 I beheld, and the same horn made war with the saints, and prevailed against them;
22 Until the Ancient of days came, and judgment was given to the saints of the most High; and the time came that the saints possessed the kingdom.
KJV
And this...
Dan 7:25
25 And he shall speak great words against the most High, and shall wear out the saints of the most High, and think to change times and laws: and they shall be given into his hand until a time and times and the dividing of time.
KJV
And this...
Dan 8:24
24 And his power shall be mighty, but not by his own power: and he shall destroy wonderfully, and shall prosper, and practise, and shall destroy the mighty and the holy people.
KJV
They are all pointing to that same "dragon" (Satan) of Revelation 12:9.