Does it? I'm curious if your numbers would support it?
One christian nutburger sets off bombs at the Atlanta Olympics after blowing up an abortion clinic. That's the only known "Christian" attack on US soil in some time, but I could be wrong.
9/11, Ft. Hood, Boston Marathon, Ohio State, Orlando, California shootings (couple left their infants behind), even the most recent incident in Ft. Lauderdale where the dude flew from Alaska to DC to FL...he was a convert to Islam. Here's a nice working list for you to peruse.
http://www.dailywire.com/news/11410/complete-list-radical-islamic-terror-attacks-us-james-barrett