The government had agreed to stop funding Shinto, which those they made the treaty with hoped this would take power away from the Emperor. So Shinto became more of a culture thing instead of a religious thing.
The Ganges is very closely associated with Hinduism.
Antony says that he should not, for then they would be touched by Caesars love for them. They implore him to read it. He replies that he has been speaking too long he wrongs the honorable men who have let him address the crowd. The plebeians call the conspirators traitors and demand they Antony read the will.