Wa laikumus salam,
Brother I know a sahih hadith for ur first question. But it is too big. So I will just quote the necessary part
Narrated by Nao'as ibn Sam'an (r): Once in a morning Rasul (Sm) talked about Dajjal...............Then Isa (A) will go to the nation whom Allah will have saved from the fitna of Dajjal. He will wipe their faces with his hand and give them the good news of their PLACE IN JANNAH. Then Allah will send His wahi to Isa(A): "I have sent My sevants, none has the power to fight them. So you will take them to mount Tur......
(Sahih Muslim, Book of Fitna and signs of The Last Hour, hadith no 7028 or 7198)
As for ur second question, I really cant understand how the christians call christ the antichrist and they have not come into the world yet !!! Though some believe that they had already come (Nonsense). According to the bible, antichrist will claim to be a prophet and will show great signs (Matt 24:24). But mahdi is not expected as a prophet. Isa(A) also wont be a prophet as he will come as a ummah of Ahmad(Sm). He will just kill Dajjal, he wont show any great sign.
It is true that the infidels call Islam a satanic cult. As they know about the overwhelming scientific and other miracles of the Quran and so they try to explain that by claiming quran as a book of satan. I also asked bro Osama a question like that and he replied too. You will find them in the general topic 'refuting answering islam on quranic challenge', post no. 8 and 9 (from the top).
However there is a big problem with calling Islam a satanic cult. I will give a few points.
The Quran says in sura As-Shuara 26:21-212
"No satan has revealed it. They are not worthy of doing so, nor do they hold the power. They have been kept deprived from listening to it."
Sura Yasin 36:60
"O children of Adam! Didn't I tell you; don't serve Satan, as he is your evident enemy?"
Well, if satan revealed Quran, he wouldn't reveal this verse, would he?
Islam gives us the most logical concept of God. The christian say three is one. Even the Jew believe that God dwells in the heaven of heavens but has a holy existence on earth named Shekinah. Some even say that Shekinah is feminine. But Islam says Allah is one and only. So which is logical? 3=1, 2=1 or 1=1? Satan wouldnt turn people towards God. He is Satan, not a saint !!
Satan is the father of all the evil and vulger things. So why on earth will he tell people to control themselves, tell women to cover their entire body and to do good deeds? And Allah says in sura Ankabut 29:45
"Verify, as Salat prevents from vulgerity and evil deeds."
The Jew and the christian calls themselves the children of God. But we simply say we are the servants of Allah, bound to obey His laws. Their bible says 'He who humbleth himself shall be exalted'. So the muslims are humble in this regard. As claiming to be children of God is not being humble, its shirk. So which is satanic?
And u said they use the book of revelation, eh? Well I have some opinions on that book. Jesus said about the false christs, "For false christs and false prophets will rise and show great signs and wonders to deceive, if possible, even the CHOSEN ONES." (Matt 24:24) John was a chosen one. So if all that nonsense things really happened, Isn't it possible that John was deceived by someone looking like christ, satan maybe?
There are many prophesies of the coming last prophet not only in the bible but also in the hindu and zoroastrian scriptures, even Buddha prophesied his coming. I am actually busy because my exam is near and I dont know the links. So I am sorry that I couldn't post any links. But do know this, no matter what the infidels say, Muhammad (Sm) was the last prophet promised to every Ummah of the world.
Noble verse 17:81
"Truth has arrived, falsehood has perished. As falsehood is to perish."
May Allah bless and protect us all. Ameen.
Tahmeed