Alright, so the Khurramites were a religious sect based on a mix of Shi'a Islam and Zoroastrianism who lived in Persia from roughly
750 CE to the 16th century.
The sect itself was unique in its beliefs, particularly in that it espoused what we would now call proto-socialism and were very socially liberal,
with a significant amount promoting free love, alcohol consumption and a general 'do what makes you happy' attitude.
So what if the Khurramites had survived past the 16th century as a major socio-religious movement in Persia and its surroundings, remaining true
to their social liberalism and egalitarianism?