No, I'm using the word correctly. You sound like a 20 year old journalism major who needs a remedial course in vocabulary. Did you attend public school?
heretic (hèr´î-tîk) noun
A person who holds controversial opinions, especially one who publicly dissents from the officially accepted dogma of the Roman Catholic Church.
Excerpted from The American Heritage® Dictionary of the English Language, Third Edition © 1996 by Houghton Mifflin Company. Electronic version licensed from INSO Corporation; further reproduction and distribution in accordance with the Copyright Law of the United States. All rights reserved.
No. He does not believe in the teachings of the Catholic Church, and was trying to change the Church to fit his own image.