Answer:
Invasion by Barbarians
Explanation:
The most straightforward theory for Western Rome's collapse pins the fall on a string of military losses sustained against outside forces. Rome had tangled with Germanic tribes for centuries, but by the 300s “barbarian” groups like the Goths had encroached beyond the Empire's borders
They think they migrated from India
The belief in many "Gods" is called Polytheism. =
Hope this helps~!
~Mistermistyeyed.