if memory serves, i posted below several months ago... mh
I recall that several people I knew went back to Iran after the revolution which had brought together secular leftists, liberal democrats, and religious activists under an Islamic banner. Both political and religious differences were blurred - as they generally tend to be - in the heady of victory. Below the Islamic umbrella, however, were competing agendas and outlooks. Even the religious activists were split; some wanted to stress Iran's culture, traditions,and values, others wanted clerical rule. Clergy themselves differed in their interpretations of Islam and its political applications/implications.
Khomeini's pre-revolutionary criticisms and denunications of the Shah were similar to those made by people across the political and religious spectrum. Better known at the time than Khomeini was Ali Shariati who had forged a left-wing Islamic political ideology and theology of liberation. Influenced by Frantz Fanon and Che Guevara sans their rejecton of religion, Shariati asserted the necessity of reclaiming Iran's religious roots (he died just prior to the revolution of a heart attack in Britain to where he'd been exiled following several years of imprisonment by the Shah, his supporters suspected the SAVAK in his death).
According to several of my Iranian friends who went from being anti-Shah to anti-Khomeini, most people in Iran weren't familiar with the latter's views on the relationship between religion and politics, most specifically, his belief in direct clerical rule and elite guardianship. The politico-religious unity of Khomeini's clerical cohorts and their lay supporters overwhelmed the cacophony of other clerical and lay, religious and secular voices, *all* of whom were subject to so-called "Islamic justice". In the process, they consolidated control over the country's cultural and social institutions.