No one knows the day or hour, or the identity of the anti-Christ. Many thought Ronald Reagan was the anti-Christ as the letters in his name were 666.    Although we are  living in perilous times, many generations thought theirs was 'it'.  Jesus will come back as a "thief in the night"  and Christians, if they stay awake, will not miss it, nor will they be deceived by a 'fake' Christ.  The 'real' Christ  is going to win, in the end.  That I do know.
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My firm belief in my 'theory' is no different than the 'science' that  portrays the 'theory' of evolution as a fact and has a  'firm belief' in it. Or the 'science' that claims people are the cause for  global warming.  Those are unproven theories taught as facts in many schools.