There is no evidence this is connected to Islam. Get over it.
Articles on this guy last night were stating he had spend some time lately staying at a mosque. So yes, there is a possibility. Whether true or not, or if it is like so many other instances is getting scrubbed so the fact can be obscured and hidden....who knows at this point. Do you trust the media and governments at this point to tell you it was about islam?
The question on his religion is valid either way.