I agree that we muslim should be united. Read the following verse of Quran.
The Glorious Qur’an says:
“As for those who divide Their religion and break up Into sects, thou hast 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.” [Al-Qur’an 6:159]
I think after reading this we and do not have to think for divide.