Tavist Smiley, like your typical lefty, is math-challenged. He says there are so many more examples of Christians going into buildings and blowing people up in the U.S. Of course, there are far more Christians than Muslims here, and the scale of 9/11 attacks were far different from post office murders.
Express the numbers in a standard fashion (e.g. per 100,000 people) and they will sure look different.
Just because they are non-muslim Americans doesn't make them Christians.
Christianity and Judaism commands you not to commit murder...
islam instructs you when, where and how to slaughter your fellow man.