Iran: Islam’s Incomplete Conquest

In contrast to its organic emergence in Arabia, Islam’s arrival in Persia in the 7th century CE was a cataclysmic event. The Arab conquests (633–651 CE) toppled the Sassanid Empire, one of the ancient world’s great powers, and introduced Islam to a civilization with millennia of philosophical, literary, and religious tradition. Unlike Arabia, where Islam built upon existing cultural frameworks, in Persia, it dismantled them.

Zoroastrianism, the dominant religion of pre-Islamic Iran, had shaped Persian ethics through its triad of “good thoughts, good words, good deeds”. Its dualistic cosmology, emphasizing the struggle between good (Ahura Mazda) and evil (Ahriman), provided a moral and metaphysical foundation for Persian society. The Achaemenid (550–330 BCE) and Sassanid (224–651 CE) empires, renowned for their administrative genius, architectural splendor, and religious tolerance, represented a civilizational high point. Yet, under Islamic rule, these legacies were marginalized, labeled as jahiliyyah, the age of ignorance, a term that dismissed pre-Islamic Persian achievements as barbaric.

The imposition of Arabic as the language of religion and administration further alienated Persians from their heritage. While Persian literature and language eventually reemerged in the form of New Persian (Farsi) under the Samanid dynasty (9th–10th centuries), the initial Arabization efforts left a lasting sense of cultural loss. Zoroastrian fire temples were converted, and the Persian elite faced pressure to adopt Islam to maintain social status. For many Persians, Islam did not fulfill their identity but severed it, creating a fracture that persists in cultural memory.

Shiism as Rebellion

The rise of Shiism in Iran, particularly after its adoption as the state religion under the Safavid dynasty (1501–1736), was both a theological and political act of resistance against the Sunni Arab narrative of Islamic history. Shiism, with its veneration of Ali and the Imams, offered Persians a distinct religious identity that challenged the Sunni orthodoxy dominant in the Arab world. The Safavids deliberately cultivated Shiism to unify Iran against Ottoman (Sunni) and Arab influence, fostering a national consciousness rooted in opposition to Arab hegemony.

This divergence was not doctrinal but cultural. Sunni Islam emphasizes the universality of the ummah (global Muslim community) and the centrality of Arab prophetic lineage. Shiism, by contrast, resonates with Persian cultural themes through its emphasis on resistance, particularly in the narrative of Hussein’s martyrdom at Karbala (680 CE) which was reinterpreted in Iran to echo pre-Islamic Persian values of sacrifice, justice, and defiance against oppression, as seen in Zoroastrian myths of heroic struggle.

Disillusionment

Even under a theocratic regime, Islam has not achieved the cultural harmony it enjoys in the Arab world. The disillusionment with Islam in Iran today is not political, a reaction to the regime’s authoritarianism, but civilizational. Many Iranians view Islam as a force that disrupted their historical trajectory, a sentiment reflected in the resurgence of interest in pre-Islamic Persian traditions, such as Nowruz (Persian New Year) and Zoroastrian symbolism.

Sociological data shows this rift. The 2020 GAMAAN survey, conducted by a Netherlands-based research group, found that only 40% of Iranians identified as Muslim, with 47% reporting a loss of religious faith altogether. This contrasts sharply with the Arab world, where Pew Research (2019) indicates that over 90% of Arabs identify as Muslim, with religion remaining central to social and political life. In Iran, the regime’s enforcement of Islamic laws, such as mandatory hijab, has fueled resentment, particularly among youth, who associate Islam with oppression rather than cultural pride.

The claim of widespread mosque closures, 50,000 out of 75,000, according to cleric Mohammad Abolghassem Doulabi in 2023, further illustrates this disconnect. While economic factors, such as currency devaluation, contribute to low attendance, the politicization of mosques as regime propaganda platforms has alienated many Iranians. In contrast, mosques in Arab countries remain vibrant centers of community life, reflecting Islam’s enduring cultural resonance.

Imagining a Pre-Islamic Iran

Iran’s disillusionment is rooted in a collective memory of what might have been. Unlike the Arab world, which sees Islam as the culmination of its historical trajectory, Iran has never stopped imagining an alternative path. The revival of Zoroastrianism, though practiced by fewer than 25,000 Iranians, symbolizes this longing for a pre-Islamic identity as a rejection of Islamic hegemony.

No comparable civilizational rupture exists in the Arab world. Even Arab secularism operates within an Islamic cultural grammar. From Ba’athism to post–Arab Spring political experiments, Islam remains the unquestioned civilizational backdrop. For Arabs, Islam is not experienced as an imposition but as an origin story. For Iranians, it remains a foreign layer, internalized, institutionalized, yet never fully reconciled with a deeper sense of self.

This is why Islam functions differently in Iran than anywhere else in the Muslim world. In Arab societies, Islam anchors identity. In Iran, it constrains it. What the Arab world regards as continuity, Iran experiences as displacement. And until that civilizational tension is resolved, Islam in Iran will remain not a source of belonging, but a reminder of what was lost.

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