If what you say is true, he tried to slip a night of sin (according to his own religion) under the radar of a just and almighty God RIGHT BEFORE he gave his life. Sorry. I'll take Major World Religions for $1000, Alex.
No matter what you think he was doing the night before he did the 9/11 attacks -- the fact of the matter is that the only guarantee in Islam for "salvation" (as they see it) is by way of fighting for Allah in battle (and that was the 9/11 attack). He could have done anything in the world, and he would have that "guarantee" in Islam.
But, at the same time, we also have Taqiyya, and that is very active and operational in this country, no matter what you think about it. It's a foundational part of Islam and is practiced all the time... even by those who live in nice neigbhorhoods and look to be a "perfect family" supposedly integrating into American culture... they know "taqiyya", too and they'll keep practicing it until they have complete dominance over you and others in this country (and they are on their way there right now).... :-)