All religions (typically) recognize human beings as fundamentally equal, whether this is understood as a consequence of their status as children of God (Judaism, Christianity, Islam), of their manifestation of the Divine (Hinduism), or of their common original nature and desire for happiness (Buddhism).
This principle rules out discrimination (could depend how that's relatively defined) against people on the basis of race, ethnicity, ancestry, socio-economic status, gender, or disability; an increasing number of people believe it also rules out discrimination on the basis of sexual orientation.