ummmm - // Andy - Christians might not publicly practise their faith as other religions do but it doesn't mean they believe less. //
I am not suggesting that they do.
My point is, there are far less a proportion of Christians who are liable to be motivated into any kind of physical action to 'defend their faith' than there are Muslims, who weave their faith into their daily lives in a way that Christians simply do not.
It's about the numbers.
You may have ten Christians, one of whom goes to church and all of whom are counted in the stats, and you may have one Muslim who is radicalised enough to do something.
Extrapolate the numbers, and the size of Christianity is irrelevant - it's the size of the fight in the dog as they say - or in this case, the willingness of the dog to actually fight in the first place.