Anna the Seeker said in post 1:
. . . how do you discern which vision is real and which one fake?
By how what the vision teaches lines up with scripture (2 Timothy 3:16 to 4:4).
Also, note that not only demons can masquerade as Jesus, just as not only in visions can Jesus be faked. For the beast which comes up out of the earth in Revelation 13:11-16 represents the literal, individual human being who will become the Antichrist's False Prophet (Revelation 19:20, Revelation 16:13). And he could be a secretly-apostate pope who at some point during his tenure will make a great push for peace and unity between Christianity and Islam. He could say something like:
"Why do we fight each other? Are we not all the spiritual children of Abraham and of his God, the one God? Can't we lay aside our foolish, man-made differences of theology, which have done us no good at all, but only brought us hatred and violence, and unite into one religion of Abraham, one religion of peace, based on love for the one God and love for our fellow man? What is more important than this?"
He could be so skillful in elucidating what the moderate Muslims could call
"the true, peaceful, loving nature of Islam", that he could be hailed by them worldwide as (in their words)
"a Great Imam, come to rescue our beloved Islam from the bad reputation falsely given to it by the terrorists". In this way, a pope could come to hold high positions of power in 2 religions at the same time, which could be symbolized by the 2 horns of the False Prophet lamb (Revelation 13:11). This would be similar to how the 7 horns of the true-Jesus lamb in Revelation 5:6 could represent the true Jesus holding 7 positions of power at the same time (cf. Jesus wearing many crowns at the same time in Revelation 19:12). And
the False Prophet could even say that he is Jesus. (But he won't say that he is Christ, for the False Prophet and the Antichrist will deny that Jesus is the Christ, and will deny that Christ is in the flesh: 1 John 2:22; 2 John 1:7.)
Once the False Prophet by his amazing miracles has brought the world under his spell (Revelation 13:13-18, Revelation 19:20), including many Muslims and Christians who may not care much for scriptural dogma, but could go wild over his signs and wonders, he could begin to (in his words)
"restore to the world the real message which was spoken by me (Jesus) at my first coming, and by the great prophet Mohammed, but which message became corrupted by power-hungry men when they copied and changed the early manuscripts of the Bible and the Koran". He could then gradually initiate the world into the Antichrist's Gnostic Luciferianism (1 John 4:3, Revelation 13:4-6), a religion which could have existed since ancient times in some "mystery" cults, and which still exists today in the highest degree of initiation of a worldwide secret society. The False Prophet could present his miraculously calling fire down from heaven (Revelation 13:13) as purported proof that Lucifer (the dragon, Satan) and the Antichrist are the true God (Revelation 13:4-8, Revelation 12:9), in an inversion of how back in Old Testament times, Elijah miraculously called fire down from heaven to prove that YHWH is the true God (1 Kings 18:37-39).