not only is it a non-renewable resource but prices also fluctuate drastically in the oil industry. A prime example is Venezuela. Venezuela's main source of income was oil. This led to dry seasons of income and mixed with the governmental misdelegation of revenue the eventual overturning of their economy. If many middle eastern countries diversified their exports to more sustainable and renewable sources they would have fewer problems with competition.
Monotheism is the belief of only one god. polytheism is the belief of more than one god. animism is when people worship other living things besides humans or statues. Hope this helped :)