Hinduism is one of the world's oldest religions, originating in the Indian subcontinent. It is a diverse and complex belief system with a wide range of practices, rituals, and philosophies. Hinduism encompasses various deities, scriptures like the Vedas and Upanishads, and the concepts of karma, dharma, and reincarnation. It is a significant cultural and spiritual influence for millions of people worldwide. 

Hinduism has a rich collection of religious texts that form the basis of its teachings, rituals, and philosophy. Some of the most important religious books in Hinduism include:

1. Vedas: The oldest and most authoritative scriptures in Hinduism. There are four Vedas - Rigveda, Samaveda, Yajurveda, and Atharvaveda. They contain hymns, rituals, and philosophical discussions.

2. Upanishads: These are philosophical texts that explore the concepts of the ultimate reality (Brahman), the individual self (Atman), and the path to liberation (Moksha).

3. Bhagavad Gita: Part of the Indian epic Mahabharata, the Bhagavad Gita is a dialogue between Prince Arjuna and Lord Krishna. It addresses moral dilemmas and provides guidance on duty, righteousness, and devotion.

4. Ramayana: An ancient epic poem attributed to the sage Valmiki, the Ramayana narrates the story of Lord Rama, his wife Sita, and the battle against the demon king Ravana.

5. Mahabharata: One of the longest epic poems in the world, the Mahabharata tells the story of the great Kurukshetra War and includes the Bhagavad Gita as part of its content.

6. Puranas: These are ancient narratives that contain myths, legends, and teachings related to Hindu deities, cosmology, and genealogies.

7. Manusmriti: Also known as the Laws of Manu, this ancient legal text provides guidelines for social and moral conduct.

These texts, along with various other scriptures and philosophical treatises, contribute to the rich tapestry of Hindu religious and spiritual knowledge. Different sects and schools of thought within Hinduism may give varying degrees of importance to these texts.