In "The Complete Persepolis," Marjane Satrapi highlights the commonality of extremism present across various religions. She underscores how every belief system is susceptible to having its radical elements that can distort the core teachings and values of the faith. This notion reflects on the human tendency to misinterpret beliefs, leading to actions that often contradict the original intent of those teachings.

Satrapi's observation serves as a reminder of the pervasive nature of extremism, which can arise from a variety of ideologies and is not limited to one specific religion. By drawing attention to this issue, she advocates for a deeper understanding and dialogue among different faiths, aiming to bridge gaps and reduce the impact of extremists who exploit religion for their own agendas.