I want to know the answer to the following question:
At that time, who helped develop materialism?
All the background I'm provided with is that "The Nyaya–Vaisesika school (600 BC - 100 BC) developed one of the earliest forms of atomism, though their proofs of God and their positing that the consciousness was not material precludes labelling them as materialists.". Is that enough to answer the question?
Answer: no