If you read anything there, where exactly did you see anyone say Rick Warren is the antichrist? I've read all that stuff already on that page and I don't recall anyone saying "Rick Warren is the antichrist." He's far too much of a doofus to be the antichrist anyway.
I have said or at least implied many times he's a useful idiot for the antichrist, that he is 'making straight the way' of the antichrist. So I guess you could say he's to antichrist what John the baptist was for the real Christ.
While I don't claim that Rick Warren is 'the Antichrist", he is certainly a good example of how people can be fooled.