The Quran makes it clear that Islam is not about universal brotherhood, but about the brotherhood of believers:What did prophet preach?(The other side of story)
The Believers are but a single Brotherhood (49:10)
Not all men are equal under Islam. Slaves and the handicapped are not equal to healthy free men, for example (16:75-76). The Quran introduces the Law of Equality, which establishes different levels of human value when considering certain matters, such as restitution for murder (2:178).
Neither are Muslim believers equal to non-Muslims:
Are those who know equal to those who know not?(39:09)
Is the blind equal to the one who sees" Or darkness equal to light?(13:16)
A believing slave is superior to a free Mushrik (one who ascribes partners to Allah)(2:221)
The Quran plainly tells Muslims that they are a favored race, while those of other religions are perverted transgressors:
Ye are the best of peoples, evolved for mankind, enjoining what is right, forbidding what is wrong, and believing in Allah. If only the People of the Book [Christians and Jews] had faith, it were best for them: among them are some who have faith, but most of them are perverted transgressors.(3:110)
As we shall see later, Allah condemns non-Muslims to Hell based merely on their unbelief, while believers are rewarded with the finest earthly comforts in the hereafter, including never-ending food, wine and sex (56:12-40).