Final answer:
Christianity was not practiced in the Mauryan Empire; during that period, Hinduism, Buddhism, and Jainism were the main religions.
Step-by-step explanation:
The religion that was not practiced in the Mauryan Empire was Christianity. The Mauryan Empire, existing from 326 to 184 BCE, was a time when various other religions such as Hinduism, Buddhism, and Jainism were practiced. Hinduism evolved from Vedic traditions and included a complex structure of gods, rituals, and caste systems, while Buddhism and Jainism emerged as new religious movements that emphasized personal spiritual development and ethical conduct. Christianity, meanwhile, is based on the teachings of Jesus Christ and only arrived in India many centuries after the Mauryan period, specifically through early missionary activities linked to the Apostle Thomas in the first century C.E. and later through western missionaries around 1500 C.E.