Zoroastrian Northeast India in the 1800s

Alright, a bit weird, but hear me out:

The reason the people of Northeast India are Christians is because they were cut off from the cultural influences from the rest of India. As such they developed their own pagan religions but they were eager to accept Christianity.

Let's say some Parsis in India are a bit sad how far their religion has fallen and decide to make a missionary movement (similar to Arya Samaj by Hindus or Tableeghi Jamaat by Muslims) to convert people to Zoroastrianism. Some missionaries go to the northeast and achieve successes. They report back to the rest of the Zoroastrian missionary movement leading to more missionaries to go there and soon the northeast gradually becomes Zoroastrian.

How does this impact India, in the long run? How is Zoroastrianism affected?
 
Alright, a bit weird, but hear me out:

The reason the people of Northeast India are Christians is because they were cut off from the cultural influences from the rest of India. As such they developed their own pagan religions but they were eager to accept Christianity.

Let's say some Parsis in India are a bit sad how far their religion has fallen and decide to make a missionary movement (similar to Arya Samaj by Hindus or Tableeghi Jamaat by Muslims) to convert people to Zoroastrianism. Some missionaries go to the northeast and achieve successes. They report back to the rest of the Zoroastrian missionary movement leading to more missionaries to go there and soon the northeast gradually becomes Zoroastrian.

How does this impact India, in the long run? How is Zoroastrianism affected?
The problem is that Zoroastrianism does not do any of this, now Buddhism or Islam might be more realistic
 
Let's say some Parsis in India are a bit sad how far their religion has fallen and decide to make a missionary movement (similar to Arya Samaj by Hindus or Tableeghi Jamaat by Muslims) to convert people to Zoroastrianism.

If such a movement emerged, it would hardly gain much steam among the highly insular Indian Zoroastrian community.

Also, that’s an immense simplification of Arya Samaj. Arya Samaj is about bring Hinduism back to basics and scrapping all the post-Vedic beliefs and stresses a specific anti-idolatric monotheistic interpretation of the Vedas. It’s comparable more to a Protestant sects.

The problem is that Zoroastrianism does not do any of this, now Buddhism or Islam might be more realistic

Or Chaitanya Vaishnavite Hinduism, which successfully converted the Meitei to Hinduism IOTL and gave the region of Manipur its name.
 
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