Difference between caste and communalism

Caste: Is a very distinctive HINDU and India practice where Humans are segregated by BIRTH into a caste. Brahmin,Kshatriya,Bania, Shudra and outside the 4 varnas the DALITS or untouchables. This division and slotting into CASTES by birth has been one of the most inhuman practice of Hindus which has prevented mixing among Hindus for marriage. Even now in the 21st century marriages are mostly arranged within the same caste groups. Nowhere else in the world such SEGREGATION of Humans is decided by BIRTH.
Communalism: Communalism implies a strong sense of belonging to a particular religious community to the exclusion of others. The concept of communalism holds that religious distinction is the most fundamental and overriding distinction that separates a particular community from others. Communalism as evident from the rise of politics based on religious identity has been an important factor in the Indian political system.