Why did Indian civilization develop religious traditions?

Civilisation can not be defined. It can be described. All civilisations flourished for successful trade. Traders had always shifted from one religion to another soon they found the old religion as obsolete and exploiting their wealth in the name of religion. Traders brought culture as pillion-rider of commodities. Trade is the fond of culture and culture is the fond of religion. Indian traders were the patrons and organisers too for new culture and religions. Therefore, not only Indian civilisations; but all civilisations are found to be linked with religion.