in his mind, he is assisting in the spread of beliefs he considers blasphemous and dangerous. of course, he's an irrational buffoon, but the world is full of irrational buffoons. this is a pretty harmless piece of buffoonery compared to, say, GAZA.
in this case, the bus company was fine with him not driving the bus, so no harm, no foul. it's the media that's sensationalized the story.