Shepherd Smith said he was horrified and he actually looked it at information he just received from a girl in the room that the shooter asked everyone to stand and state their religion.
Obviously, with some witnesses like her left alive, we will eventually know what religions were shot. Guessing it wasn’t Muslim.
With so many dead and wounded, the most logical religion would be Christians.
Shepherd also mentioned the forum 4Norm.
My guess (especially if the perp is/was "Toby Reynolds") is that this was not Islam but a garden variety psycho. Probably on heavy meds, from broken home, etc.