It's a good way to both highlight the difference between Christians, Christianists, and Christianofascists, AND it shows that Islam and Christianity have the same problems that people everywhere do...
We need more of this!
Republican, Republicanist, Republofascist.
Democrat, Democratist, Demofascist.
Microsoftie, Microsoftist, Microfascist.
... ...
The list can go on and on!