A civil war on Indian soil is highly unlikely, since the people got a different mentality than other places. The idea of India as a nation is not new, even though it actually consists of a number of smaller countries that historically were kingdoms and such. The Indians refer to their country as Bharat, which is featured in the prominent work Mahabharata (the great Indian war), a vast literaric work of over 200.000 verses.
Beyond the political dimension, the Indian people are united through what is commonly referred to as "Hinduism", though that term barely describes the complexity of their world view. In Hindu cosmology the creator (Mahavishnu aka. Krishna) lies dreaming up infinite worlds (multiverses so to speak) which are then fashioned by a creator (Brahma), a position that can be achieved by any Jiva (living entity) inside those worlds. These worlds come into existance and are annihilated in a regular cycle. All living beings, as well as all things inside those worlds, are extensions of Krishna and he experiences those multiverses (Brahmandas) through the senses of all living entities. This is important to note, since it lays the foundation for Hindu thought: that all of creation is part and property of the same creator, so any kind of border or differentiating identity is nonsense, since it's all part of Krishna anyways.
This much all Hindus agree, although the label "Hindu" does not appropriately describe their individual views. The cosmos being inhabited by countless Devas (heavenly beings), Hindus worship different of those. Some worship Shiva, the destoryer, others Brahma, Ganesha, Sarasvati, Kali, etc. but all agree on those basic concepts mentioned before. Through religious service and devotion they try to attain a life on other worlds (lokas) in the cosmos. Some Hindu delineations explicitly state that "begging" for liberation from the misery of our world (Bhuloka = Earth) is a waste of time and that only science and technology will deliver you elsewhere (go, NASA).
Beyond that, different Devas have historically acclaimed guardianship of countries, such as the white Tara who protects Nepal. If any major conflict were to arrive in India, a repetition of the events in the Mahabharata is likely to occur (human armies on the ground, heavenly armies up above). In such a conflict any aggressor who violates the property of some authority would face a harsh fate. There have been some minor incidents in the past where US navy fleets were getting BTFO'ed or groups of tanks molten into shit, but they're pressing their luck lately with all those wars in the Middle East, killing off Semites left and right.
As for a war between China and India, this, too, is highly unlikely. China has been ramping up the construction of monuments all over the country, with Buddhist shrines and temples housing ancient relicts. There are some quite magnificient buildings finished and in progress, so I doubt they'll shit where they eat (Buddhist Devas are identical to the Hindu Devas, they share a lot of views cosmologically).