I was in anger complaining of a taxi driver I said is this how we treat Muslims is Islam just a culture? We should leave Islam and not worship Allah but Jesus I did not mean it literally with niyyah a senior shaykh told me it's kufr I should say shahaada and repent I did but I wanted toaskagainkufr?

Ustadh AbdulAziz al-Haqqan

Since you have asked a senior sheikh then act upon what he said.