False equivalency. If "Satan" is involved in school shootings but it seems to have fooled you into thinking that Jesus is God- he denied that explicitly- and that he is coming back to "save" you and others who believe the thing you do. If anything, he is likely to say, "I never knew you."

I'll say it again: there is no reason to think Jesus is coming back. As he taught, he came and showed the way; your salvation is up to you to work out; God excuses no one from that responsibility.