Iran is the birthplace of many branches of Sufism. My father was once interested in them and went so far as visiting some of their places and even showing us their photos books etc.
They are known for their odd behaviors (eg. stabbing themselves without bleeding, knowing "secrets" etc.). Their beliefs include:
1-contempt for natural and human joys.
2-contempt for human logic and human philosophy, emphasis on holy craze.
3-emphasis on "esgh" or "asq" which is translated love but is very different from agape, erose and other things we have in our faith. It is an unconditional, unknowable, shapeless, nameless union with god without any regard for eternity. free will and goodness has no place here. You must be chosen before birth.
4-idea of pre-existance of soul.
5-dances and swoons and wonderworks.
And to our surprise: the idea of having holy spirit in them! The name of the holy spirit is in quran though not as God, but as an angle. Even the famous persian poet "Hafiz" names him as a 'spiritual, impersonal source of power'.
Now my question: don't they remind you of several heresies like charismatics for example?