DRavidians followed sraminic systems and aryans followed brahminic ( vedic system).... Dravidians were never hindus. They way most of red-indians are converted to christianity, similarly dravidians were converted to dalitism during bhakti movement when 10000s of dravidians were mass murdered and their temples were converted. This is historical fact however missing from Indian brahminic history.
Dravidians were originally sramanic. even in indus valley non of vedic god's evidence was found. it was adi bhagwan of sramanic system. Same system was later known as jainism after 24th thirthankar when vedic torture ruined our social fabric. Infact non of vedic system has god worship system, except nature forces. These facts have been proven by most of non-brahminic scholars in India as well as all over world. But in india these historical facts will not show up. Couple of dravidian historians were murdered mysterically for bringing out these facts.