He wasn't trying to kill Islam, he was trying to provoke gun-control, national and international divisions, and inspire civil and uncivil Islamic resurgence.
For once, I mostly agree with you. Although I do believe any white nationalist is trying to purposefully and violently exterminate and/or expunge any so called "white" country of anything they don't like, these terrorists mostly just want to create havoc with the belief that it was spark some sort of uprising.
In our religion, god is not a man.
Its clear that you have it all figured out.