--------- is it important to have sects in islam ?

As for those who divide their religion and break up into sects, you have no part in them in the least: Their affair is with Allah: He will in the end tell them the truth of all that they did. He who does good shall have ten times as much to his credit; He who does evil shall only be recompensed according to his evil: No wrong shall be done to (any of) them. Al Quran 6:159 [ Surat Al-'An`ām (The Cattle) ]