I'm biased (a Christian myself), but the Christians I know are not violent, probably because they're at least half-decent human beings who at least try to practice what they say they believe (which doesn't include deepfry oil).
I know a handful of nuts, some claim to be Christian, some don't. Of the ones that claim to be Christian, none I know actually seem to live anything close to what they spout off. As a general trend in my circles, they're the loudest about their faith, the most political/patriotic (either side, but usually right leaning), and most likely to force their beliefs on others. The ones that don't claim to be Christians are pretty similar, just less hypocritical (opinionated, but not religious).
The issue is that anyone can claim to be a Christian, and as a Christian it's not for me to judge and say if they really are genuine or not.
All that to say, this article is a great example of not living out a good Christian faith, at all.
I used to frequent the FOSSCAD IRC ages back as a teen. This started during the post-Liberator panic, there were talks about regulating 3D printers to not allow printing guns, etc. Designed a few things, never actually printed any of it myself, but some others did. Really got me into engineering before I exited the scene, led to actually pursuing an engineering career. Was surprised to see 3D printed gun videos so openly shared, it was pretty underground for ages there.