[Tejas Rob]

It's not "against the gods", that patch says "Against all Gods". It's some sort of death/black metal thing. Here's the patch you can buy...

[Ann Archy]

I was RIGHT...No GOD in his life!

[Steve_Seattle]

The “Against all Gods” patches are manufactured by a company called “Blackcraft,” which seems to specialize in occult, demonic, and satanic themes and imagery. Maybe we are getting a glimpse into the shooter’s mind, but this is all preliminary speculation.

[reformedliberal]

Thanx!

It was one of Marilyn Manson’s tours.

Against All Gods Tour - Wikipedia
https://en.wikipedia.org/wiki/Against_All_Gods_Tour

Against All Gods was a worldwide arena tour by American rock band Marilyn Manson. It was the ninth tour the band embarked upon and the sixth to span over ...

Also a series of novels and a film.

https://www.google.com/search?client=firefox-b-1-d&ei=AhFHXcuYFZbVtAaX7JOIBg&q=Against+All+Gods&oq=Against+All+Gods&gs_l=psy-ab.12..0i131l2j0i7i30j0l7.27653.30242..33053...0.0..0.117.591.7j1......0....1..gws-wiz.......0i71j0i13j0i13i10.TqdKE3jDpsM&ved=0ahUKEwjLoaia2unjAhWWKs0KHRf2BGEQ4dUDCAo