Gembul started his career on
YouTube and made videos discussing science, technology,
social philosophy, and
conspiracy theories. His thoughts on moderate Islam and his criticism of religious communities in Indonesia made his content quite popular in Indonesia. Guru Gembul emphasized that he was neither a
Sunni nor a
Shia, and that he did not follow any Islamic sect. As a result of his criticism of the "
kaum Habaib" which is translated as people who respect the
habibs, Guru Gembul was accused of being an
extremist. His conflict with
Bahar bin Smith, one of Indonesia's
habib and
ulama, began when Guru Gembul noticed that Bahar could not read the
kitab kuning, a set of Arabic-language educational texts in the Islamic curriculum commonly used in
boarding schools in Indonesia, correctly. Guru Gembul regretted this, and called Bahar bin Smith a "fake cleric", and doubted Bahar's lineage as a respected
habib. Guru Gembul then highlighted the use of false
hadith in Bahar's statement which asserted that he was truly a descendant of the Islamic prophet
Muhammad.
Rhoma Irama and Zein Assegaf, other public figures who were also in conflict with Bahar at that time, agreed with Guru Gembul's statement, regretting that this had happened to a cleric. Furthermore, Rhoma and Guru Gembul challenged Bahar to prove the authenticity of his lineage through a
DNA test, this offended Bahar, stating that he could agree to it, but with a number of conditions. In a seminar in
Bandung, Guru Gembul criticized the education system in Indonesia, and pushed for changes to the education system. He also criticized the low salaries given to teachers in Indonesia, which he said was what triggered the decline in the quality of Indonesian education. == Controversy ==