Assalam alykam these christians hold on to their belief so strongly they twist their own information and our information regarding the dajjal
they say our concept of Dajjal is The real Jesus and muslims will fight him and imam mahdi is the anti christ and Isa.is the false prophet they twist their own to fit their belief and twist ours to make us the bad guys
here is the article that needs to be answered
http://www.answering-islam.org/Authors/JR/Future/ch09_comparing_the_biblical_jesus.htm