petro-dollars and progress

• It seems the petro-dollar is setting in motion a very bad chain of actions in the arab world and the world...  
• The saudis are using that easily earned money to fund an otherwise unattractive and very backward religion, i.e. wahabi islam. without petro dollars that 7th century backward form of religion would not exist.
• The problem also is that, those petro-dollars get invested/cycled through banks in the western world, and are also used to buy useless weaponry for a country that is practically still living in the 7th century... 
• so, those beneficiary banks, and weapon making companies in the west have big stakes in preventing the saudi entity from changing and thus are indirectly contributing to the spread and financing of wahabism in the arab world and around the world...
• why don't the west just take the oil and break this cycle since given the above scenario, ...  the oil has been a curse preventing the people of that part of the world from being forced to compete in a 21st century world and thus adapting and evolving from the 7th century world they are still living in and they are exporting ... thanks to the petro-dollars...