'THE whole world is mov ing towards God," Ira nian President Mahmoud Ahmadinejad has written to his American counterpart, George W. Bush. "Would Your Excellency not wish to join?" In Tehran, the Persian text of the letter has become a favorite topic at dinner table conversations and is often the source of much mirth because of its flowery style, its numerous spelling and grammatical errors and, above all, the insight it offers into the mind of a man who clearly sees himself as an agent of the Hidden Imam in hastening the end of the "Infidel" domination of the world....