In places like the UK and US I am sure there are some white muslims. But if you think they constitute anything more than a miniscule portion of the group......Think again Einstein. And I am sure that many are like the Richard Reid (the shoe bomber), white converts to islam are usually nutty looking enough to be noticed. Profiling....as much as you will hate to admit it, will work. But hey, if you think EVERYBODY should be searched....fine. Just don't whine if you have to leave for your trip 12 hours early so you can get thru the lines.
I am not opposed to racial profiling, but then again, those two in the picture weren't American or European converts to Islam, they were hard-core Muslim Palestinians. A large percentage of fanatic Muslims have very European-esque features, and a lot of them DO take part in suicide missions. And they were in a Hamas procession (look at the picture again, they were not in an animal rights protest, they were dressed like suicide bombers). Now if you can't single them out from the rest of the crowd, how in the world are you going to tell me all would be safe if you only checked a couple of brown-skinned people?
Well, if you really think your plan will work well, let me warn you the safety is worthlessly fragile. Islam has more tricks up its sleeves than you think. It is the most virulent, most diversely penetrative parasitic, demonic cult that this world has ever seen. And yes, it has crossed almost all racial and cultural barriers.