Muslims believe that in the end times that in the end times a figure named Imam Al-Mahdi will appear to restore peace to the world, He's going to be with their Jesus and Jesus is going to destroy all the crosses in the world, claim that he's not the son of God and make everyone worship Al--h.
The real historical Jesus of the bible warns us that in the end times there will be many Christ(s) claiming to be him. The book of Revelation expands on this and warns us of three figures which are Satan, the antichrist and the false prophet. The book warns us that there will be many false wonders & signs used to deceive many people.
Daniel (God's prophet) tells us:
He will show no regard for the gods of his fathers or for the desire of women, nor will he show regard for any other god; for he will magnify himself above them all. But instead he will honor a god of fortresses, a god whom his fathers did not know; he will honor him with gold, silver, costly stones and treasures.
When Jesus appears, Every eye will see him (Luke 21:27 .. Revelation 1:7) and no one will have to say "Look, Jesus is over there, Let's go see him" (Matthew 24:26).
If you see a anyone with superpowers, flying, bringing fire down from heaven, or healing people claiming to be Jesus then don't believe it - when Jesus appears, every single person on the Earth will see him on the clouds of glory. If only 100,000 people see him then it's not him, if only 1 million people see this figure then it's not him but EVERY eye will see him. This is a warning so you're not deceived:
For false Christs and false prophets will arise and will show great signs and wonders, so as to mislead, if possible, even the elect. Behold, I have told you in advance.
Matthew 24:24
I have said all these things to you to keep you from falling away. They will put you out of the synagogues. Indeed, the hour is coming when whoever kills you will think he is offering service to God. And they will do these things because they have not known the Father, nor me. But I have said these things to you, that when their hour comes you may remember that I told them to you.
John 16:1-4