WASHINGTON (Reuters) - Osama bin Laden may be the leading symbol of global Islamist militancy but the al Qaeda leader wields less influence over Islamist ideology than more obscure religious thinkers, according to a new study issued on Wednesday. The study also found that Ayman al-Zawahri, bin Laden's second-in-command, appears to be insignificant among Islamist intellectuals despite his image as a driving force behind the al Qaeda network. The Militant Ideology Atlas, compiled by the Combating Terrorism Center at West Point, instead showed Palestinian cleric Mohammed al-Maqdisi as the most influential living Islamist thinker. Maqdisi, reportedly a mentor to the...