Question Summary:
Introducing oneself as a follower of a certain sect.

Question Detail:

 
Is it permissible for a Muslim to say to others that I belong a perticular sect, madhab or school of thought like Deobandi, Sunni, ahl-e Sunnah waljamaah, wahaabi etc, or should one restrain from it and introduce him/herself just as a Muslim? What ruling does Quran & Shariah provide on this?

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
Kindly contextualize your query in order for us to advise.
And Allah Ta’āla Knows Best
Abdullah Ghadai
Student Darul Iftaa
Michigan, U.S.A 
Checked and Approved by,
Mufti Ebrahim Desai.