Not that you said as much and maybe I'm reading you wrong, but you kind of infer that Belgium does border a Moslem country. As far as worrying about Mexicans, you're right, they share a Christian ideology similar to ours so it helps.
That's a naive view of things. A "favorable religious attitude" does not in any way or form change the problems the US is currently facing.
L'america, despite its advantages to Europe(size, attitude of populace in some areas, military, ...), has a far more dangerous road ahead because her core definitions have been severly altered - especially when taking into account how young this nation is.