Fanaticism is a noun descripting a fanatic character, spirit, or action. It can be used only as such. Ex., "Adolf Hitler exhibited a form of Anti-Semmetic fanaticism." or "The church was hurtled into inappropriate fanaticism."
When Islamic fundamentalists demanded the death of Salman Rushdie because his novel questioned their faith, world opinion condemned them for their fanaticism.
His fanaticism for his favorite sports team led him to paint his entire car in their colors and attend every game, rain or shine.
The prefix for obsessive would be obsism, and the prefix for fanatical would be fanatism.
G. Vale has written: 'Fanaticism' -- subject(s): Fanaticism
Joseph Rudin has written: 'Fanaticism' -- subject(s): Fanaticism
try either extremism or fanaticism
fanaticism
Religious fanaticism
The religious fanaticism in Alexandria.
Tyranny, fanaticism, and ignorance.
Characteristic of, or relating to, fanaticism; fanatic.
extremism or fanaticism