It is commonly claimed that Wahhabism, the strict form of Islam originating in the Kingdom - and the Saudi state's aggressive promotion of it - has fuelled terrorism.
Saudi Arabia is also accused of funding IS, either directly or by failing to prevent private donors from sending money to the group.
Saudi Arabia holds a lot of blame for the spawning of modern terrorism. The Saudi Royal family has funded radical clerics in schools that became breeding grounds for Islamic terrorism. Furthermore, the Saudi government has been complacent when it comes to cutting off the funds from many Sunni terrorists networks. Therefore, Saudi Arabia is responsible for the rise of modern terrorism.
Terrorism has spawned from many locations, including Iraq, Iran, Afghanistan, and the United States of America. It is both impossible and fallacious to pinpoint it to one particular country. If Saudi Arabia were to blame, it would be a lot easier to identify and prevent the causes of modern terrorism.
I think issues with terrorism, extremist Islam and the rest of the Middle East is a complex and convoluted issue that has no real simple answer. While Saudi Arabia can be partially to blame there are other countries and groups involved that are just as responsible as them. The roots of modern terrorism goes back for along time and there is no easy solution to the problems presented.