He is a follower of wahabbism, and has appointed himself as an imam (spiritual leader. If that is supposed to be capitalized, I apologize).
It is the same, they are both the same name and the same person just different spellings.
They are most likely calling Osama Bin Laden Usama Bin Laden because they could have made a spelling error or They thought it was usama because its sounds close to usama
No, he doesn't.
Osama bin Laden was schooled at Al-Thager Model School.
Sophie Blanchett, Rachelle Cummins and Lewisama Bin Green