Which of the following is the main religion in India?

Hinduism is the main religion in India, with over 80% of the population identifying as Hindu. It is one of the oldest religions in the world, with a rich tapestry of traditions, rituals, beliefs, and texts that play a significant role in the cultural and social life of the Indian subcontinent. The religion encompasses a wide variety of practices and philosophies, with prominent concepts such as dharma (duty/ethics), karma (action and its consequences), and moksha (liberation from the cycle of birth and rebirth).

In the context of the other options, Buddhism and Christianity also have significant followings in India. Buddhism originated in India but has diminished in number compared to its peak centuries ago. Christianity has a notable presence, particularly in specific regions, but it does not surpass Hinduism in terms of overall adherents. Judaism, while it has historical roots in India, represents a very small minority of the population. Thus, Hinduism's deep cultural integration and numerical majority make it the principal religion of India.