Some Paki Punjabis do have a inferiority complex but that’s nothing to do with Ummah, the Ummah is a bouquet of various flowers who respect and love each other whilst celebrating their diversity.
Islam or the concept of the Ummah is not the reason for Punjabi ppls inferiority complex rather their love for fair skin and their desire to associate with fair skinned Central Asian and West Asian people through the common Persian/Arabic words in Urdu is (even though Urdu in actual fact has the opposite effect and makes them closer to India)…