Answer:
The answer to the question: From about 320 C.E., until the 500s C.E., why did Hinduism have more of an influence in Northern India than any other religion, would be: Because the Gupta Empire (320-550 C.E.,) imposed it as the state religion and thus used it as a means to unify the empire. It also became popular with people because it was widely taught to the people through the educational system that the Gupta established.
Step-by-step explanation:
The development of religious belief in India has not been a simple one. Up to this date scientists, and Indians themselves, do not know for sure which was the true origin of religious belief in India, but they do know for a fact that from the time of the Vedic texts, religious belief began to take the form of what characterizes Hinduism, with the cult to Shiva, Vishnu and Devi. The Gupta Emperors took on this form of religion and expanded it through their empire as the official one. Through educational systems, and thanks to the standardization of Hinduism as the one faith, most of the Indian subcontinent was unified under the Gupta rule.