Naomi, just as there are lapsed Catholics who don't give a hoot for religion and non-practicing Jews there are many people who have been raised in the Islam faith and don't practice it.
There are such people who are practicing homosexuals, alcoholics, gamblers and eat pork and never set foot inside a mosque. There are many people raised as Muslims who have converted to another religion, those that occasionally attend mosque to appease their family but don't bother otherwise and those that lead good, normal lives but have just given up on their faith.
I am proud to have a family member who is a Somalian refuge, seen things that give her nightmares and has lost the majority of her family in the crisis. She has married in to a Christian family and is a member of the British armed forces - the RAF, to be precise. She is not a practicing Muslim and is considering converting to Christianity.
I am a white, middle aged man but have as much in common with Fred West as I do a beluga whale. You cannot judge a whole community of millions of people by the actions of some.