Fanaticism exists on many levels. It is in a nut shell aberrant destructive human behavior resulting from a person(s) dwelling on one subject too much. Its a lack of balance really in their approach to whatever the subject is, be it religion or something else.

Not only are the behaviors you listed fanatic but I would classify the people riding around in the minivan with all the "I (heart) Jesus", "Jesus is my co pilot" and fish stickers yet who treat everyone around them like crap as fanatic as well.

Another example of fanaticism in the extreme would be the nutjob who broke into David Lettermans house, or the wacko "fan"-atic who killed Rebecca Schaeffer.