Hinduism are not pagan and India and outlying countries under its influence had a high level of thriving civilization long before Jesus Christ was born. Including trade. People who have not studied Hinduism deeply often do not know that its foundation is indeed monotheism - the first in the world.
Hinduism is pagan. Pagan is the belief in many gods and in imanent divinity. Hinduism is a vast congeries of pagan systems that added to each other as one group conquered or absorbed another. The spirituality of the Gita is pagan spirituality. It is high order paganism that approaches the atheism og Gautama, but paganism nonetheless and never affected any large part of the population. It could inform the lives of a very few in the ruling class. The lesser folks concentrated on the multiple gods and spirits and worshipped by propitiation of those gods.