It is difficult, if not wrong, to sit in front of the computer and estimate the reasons for mass human behavior. The way to answer your question is to perform scientific studies. For that reason, take what I am saying with a grain of salt, and be reminded that they are based on my subjective experiences.
Atheism may be increasing in the Middle East due to religion-related traumas of oneself or friend/family, desire for freedom, better education, and better access to information on the history of religions.
Thanks to the internet, people look for unbiased answers to taboo questions, and they anonymously investigate what their parents’ religions really are.
Furthermore, an increasing number of Muslims in the Middle East socialize with non-Muslims online and realize that the religion they believe in is an accident of geography. Virtually nobody believes “Jesus is God,” or “Mohammed is the savior” unless they are indoctrinated in their parents’ religion as a child.
In the Middle East besides atheism, deism (not to be confused with theism) is becoming popular. As you may know, deism is a philosophical position and rationalistic theology that rejects revelation as a source of divine knowledge.
Deism also asserts that empirical reason and observation of the natural world are exclusively logical, reliable, and sufficient to determine the existence of a Supreme Being as the creator of the universe.
In practice, there is no difference between deism and atheism other than the fact that deists privately believe that there is a creator.
