I have a suspicion that the perpetrator might be psychotic, which, if true, raises questions on how he was working as a psychiatrist. In any case, we'll find out at some point, because he will surely be assessed.
The next thing would be for someone to drive through a women's march due to fear of patriarchy. Or mass-shoot people praying in a mosque because of fear of over-christianization.
I can't find any source saying he hated Christianity. You seem to, again, be making up facts so they fit your interpretation of things. All sources I have say his most likely motive was fear of "over-islamization".
Here's my list of symphonic metal albums from the bands that I know of, this list is defined by the terms of "atmospheric/bombastic sounding". This is my first time of making list on this site, so some of this might not make any sense as I'm still a bit confused myself as well, and I don't really prefer to see these in particular orders.
This list can be changed over the time and I might add more albums later on.