North Easterner here but living in the north.
>Is it true most of you guys are christians?
It depends on the state. Assam, Manipur and Tripura are predominantly hindu but each has their own culture and tradition that are distinctly different from traditional hinduisim. Rest are mostly Christians. Overall, I think Hindus are the majority. There are also Muslims and Buddhists and followers of traditional religions.
>Is it true you are separationists?
No, it's not true. While there are people who feel estranged and not really Indian for reasons such as look, discrimination within India as well as abroad (for eg., I've heard anecdotes of people being questioned about the authenticity of their Indian-ness at airports and being delayed). People also feel isolated and ignored by successive governments. But people who demand separate nationality or sub-nationality are mostly insurgents and militant groups. Common people either don't care whether they belong to India to are just content to be in India.
>Have you faced discrimination in the mainland?
Yes, I have. Several times. But I guess that's primarily because they think we're not Indians (I've been mistaken as a Chinese, Jap, Koreans, et cetera; and also been called by coarse names such as Corona, virus, and on and physically abused on one occasion).
>How is life in your state? Is it poverty stricken or decently developed?
Life is pretty decent and most people are content with their life--they're mostly self-sufficient. Most people have their own land, eat their own produce. But people are migrating to towns and cities and have taken trade and business as their chief occupation.
It's not developed but people are not poverty-stricken either. It's a pretty egalitarian society--neither opulence nor penury.
>What are your opinions on Bangladeshi immigrants?