Do I believe they are in paradise? No. Although its quite a complicated subject, let me try to explain why.
In Islam, one who dies striving for JUSTICE goes to paradise. Now, if you look at people like OBL, are they striving for justice? Did Afghanistan have a just Islamic society following Islamic law? Of course not. Because you see women oppressed, you see drugs significantly being sold for AlQaedas economy, you see people getting thier hands cut off for minor crimes, you see people getting killed unjustly, this is not justice. What is fighting for justice? Fighting dictators could be one way. Did OBL ever thought of getting rid of Mubarak? or King Fahd? I mean if you think of yourself as being strong enough to fight the United States, then what's Saudi Arabia???
Now what did these 19 hijackers do? They killed 3,000 civilians who had nothing to do with thier situation. I would like to know, how is this striving for justice? How is beheading a defenseless human being in such barbaric ways justice?
I would just like to know what form of Islam teaches that martyers that kill people will go to paradise, Saladin...
None. Although you could say Wahabism, but it supposedly also follows the Sunnah(Prophet Muhammad's sayings and doings). Wahabists are extremists. Fortunately, they are losing followers by the day. But they have been spreading thier form of Islam worldwide with the help of thier saudi oil income. They build mosques in many parts of the world. In Bosnia for example, Muslims pray in thier mosques but don't approve of thier Wahabists policies. The Imams, although threatened, are speaking out against them.(this has hardly had an effect)
It all really depends on what you view as just. These extremists view thier doings as just. Many modern Islamic scholars have denounced thier actions. Did you know that Iran, for example, had moments of silence during events such as soccer matches for the victims of 9/11? Did you know that the most prominent Islamic scholar, Yusef Al-Qaradawi, said "?those people (extremists) hurt Islam and Muslims with the wrong behavior they do; as the threat they pose to Islam is much more than that of the enemies of Islam who fight it tooth and nail, both in darkness and broad daylight.? But denouncing them isn't enough. Muslims in the Arab world need to unite and remove the dictators before they can remove such extremists. If there is one thing that Arabs lack in the Middle East, it is organization.
You could say what OBL did to the soviet communists was actual Jihad. If he had died, he would have gone to paradise. He was a true Muslim hero back then. But now, after all the attacks this past decade, he's just another wahabist.
I hope this makes it clear.