Answer 1
Any Muslim is shia or sunni based on his beliefs even if himself is not aware of being shia or sunni.
Any sufi is shia or sunni.
most of sufi leaders in history have been sunni.
sufi has many branches and most of them are deviated. for example some of them say namaz is not needed.
real sufi means paying more attention to spiritual aspects of Islam. but does not mean leavings Islam rules.
Answer 2
Sufis are not "milder" than Sunnis or Shiites; in fact, they are all either Sunnis or Shiites. They are just less concerned with the dogmatic observance of the law that orthodox Sunni and Shiite Islam are based in. Sufis are mystical and while following the law, they seek to have an emotional relationship with God. There are many different groups of Sufis and most live relatively similar to monks, wearing special robes and living poorly and chastely. One particular group is the one that the question refers to called the Whirling Dervishes. They are commonly found in Western Anatolia and believe that they can connect with God by spinning around while meditating on His attributes.
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