http://www.sltrib.com/ci_5218570

There is no mention of the shooters religious background. Police still havent determined any motive for the attack. but this does give us some details:

The 18-year-old man who shot and killed at least five people Monday night at Trolley Square has been identified as Sulejmen Talovic, a Bosnian refugee who lived in Salt Lake City.
Chances are he is a muslim youth, so the shooting could be terrorist motivated. Its till to early to tell but It seriously could be.