What evidence do you have that they weren't Muslims? Are you the Islamic Pope who excommunicated them? I don't think any one Muslim including yourself (and if you aren't a Muslim then no way can you say who is and who isn't a real Muslim) has the authority to do that. How can you say bin Laden isn't a Muslim if he says he is one? They 19 hijacker and their many financial backers in and out of the US really were and are Muslims.