God Almighty don't let this degenerate into another religious/racial thread!!!
The point is that terrorists aren't looking for recruits as Clear Prop said - they are looking to inflict terror. If that means that any pilot could be used/coerced into doing a 9/11, or carrying a bomb, or any other terrorist activity through threats to their families, blackmail etc then the terror becomes even greater.
And before you all start posting things like "I would never do that ", "no-one could ever make a clean-living white Christian do that" etc. think of all the poor stooges who have been used by the IRA and ETA and other Western European terrorist groups over the years to drive bomb laden cars through checkpoints and into cities - not islamic extremists , not religious fanatics , but normal citizens of westernised, christian democratic countries forced into situations they cannot control.
I think that probably includes us, doesn't it? Keep your eyes open.