In India why most of the church follows rituals of Hinduism?

The hinduism is the only religion in the world containing essense of vedas, upanishads. The hinduism was created by the great rishis, famous knowledgeable gurus. The hinduism is not with one god or with one guide or one scripture. Huge treasure is there. Like bees search of honey, the other religious people copying hinduism and the christianity is top and one of them.