The greater environment, as you put it, is too general a description of the anti-Christian movement. This anti-Christian movement is the center piece of the secular progressive agenda that is being spread across this country by the far left, hate America crowd. The anti-Christianity movement is based largely on the fundamentalist opposition to the homo-sexual life style, and I won’t be at all surprised if we find out that this shooter was gay. He may not have been, but that seems to be the most common basis for the leftist antipathy toward Christianity.
I find your definition of the progressive movement to be too narrow. It is actually an Anti-religion movement and to be even more specific an anti-organization movement. Christianity is simply the biggest first target. Hey..it worked in Europe..so the marxists are trying it here.