Why do these shootings in Christian churches occur in “evangelical” Christian churches — Church of Christ, Baptist, etc.? I don’t recall any in Episcopal, Catholic, Presbyterian, or similar. (Not saying it didn’t happen; I just don’t recall.)
This was a Church of Christ. It's probably the least "evangelical" of any Christian church. Very conservative, very traditional. I grew up in the Church of Christ. No wearing shorts, no dancing, no musical instruments played in church, immersion baptism only. They used to believe that only members of the Church of Christ would go to heaven. I doubt they still believe that but I don't know.
In Europe, they attack Catholic churches.
In the southern US, bad guys would very likely encounter well armed Hispanic Catholics and equally armed Redneck Baptists. One might guess Episcopal members would be the last armed. Synagogues might need to consider the safety issue after so many attacks especially in the northern states.
It’ll be interesting to hear what his motive may have been in choosing this particular church or religion. Could be he was out to get one particular person or thought a C of C wouldn’t be armed or something else.