What strikes me and I'm only talking for myself is how Muslims kind of police each other. Even in my youth when Catholicism still had a grip of my country I never seen the anything like the iron grip Islam has on its followers.
A couple of little examples;
I'm staying in a hostel in Amsterdam, you had to show your passport, so I showed my American passport to the Middle Eastern owner. That night I'm dragged out of my bunk and laid into my the owners two sons. Of course they said later it was all a big mistake, blah blah, bullshit they attacked me because I was American and they were Muslim.
Then something that at first might seem insignificant, I'm in a chipper in Queens Park, London, now first off I must explain I tan well, anyway I'm in the chipper and I ask the nice lady behind the counter who happened to be Muslim for a steak and kidney and chips, hmmm, and she wouldn't give it to me because she thought I was Muslim and it was ramadan, crazy.
That's just two little personal examples I think, of how much of a grip Islam has on its followers. Deep rooted.