Theism in the context of "Polytheism"

Historically, evidence of atheistic viewpoints can be traced back to classical antiquity and early Indian philosophy. In the Western world, atheism declined after Christianity gained prominence. The 16th century and the Age of Enlightenment marked the resurgence of atheistic thought in Europe. Atheism achieved a significant position worldwide in the 20th century. Estimates of those who have an absence of belief in a god range from 500 million to 1.1 billion people. Atheist organizations have defended the autonomy of science, freedom of thought, secularism, and secular ethics.

In Hinduism, the conception of God varies in its diverse religio-philosophical traditions. Hinduism comprises a wide range of beliefs about God and divinity, such as henotheism, monotheism, polytheism, panentheism, pantheism, pandeism, monism, agnosticism, atheism, and nontheism.

Forms of theism find mention in the Bhagavad Gita. Emotional or loving devotion (bhakti) to a primary god such as avatars of Vishnu (Krishna for example), Shiva, and Devi (as emerged in the early medieval period) is now known as the Bhakti movement. Contemporary Hinduism can be categorized into four major theistic Hindu traditions: Vaishnavism, Shaivism, Shaktism, and Smartism. Vaishnavism, Shaivism, and Shaktism worship the Hindu deities Vishnu, Shiva, and Devi as the Supreme God respectively, or consider all Hindu deities as aspects of the same, Supreme Reality or the eternal and formless metaphysical Absolute, called Brahman in Hinduism, or, translated from Sanskrit terminology, Svayaṁ-Bhāgavan ("God Itself"). Other minor sects such as Ganapatya and Saura focus on the deities Ganesha or Surya as the Supreme.

The Smarta tradition (Sanskrit: स्मार्त, IAST: Smārta) is a movement in Hinduism that developed and expanded with the Puranas genre of literature. It reflects a synthesis of four philosophical strands, namely Uttara Mīmāṃsā, Advaita, Yoga, and theism. The Smarta tradition rejects theistic sectarianism, and is notable for the domestic worship of five shrines with five deities, all treated as equal – Ganesha, Shiva, Shakti, Vishnu and Surya. The Smarta tradition contrasted with the older Shrauta tradition, which was based on elaborate rituals and rites. There has been a considerable overlap in the ideas and practices of the Smarta tradition with other significant historic movements within Hinduism, namely Shaivism, Brahmanism, Vaishnavism, and Shaktism.

The Smarta tradition developed during (early) Classical Period of Hinduism around the beginning of the Common Era, when Hinduism emerged from the interaction between Brahmanism and local traditions. The Smarta tradition is aligned with Advaita Vedanta, and regards Adi Shankara as its founder or reformer. Shankara championed the thesis that ultimate reality is impersonal and Nirguna (attributeless) and any symbolic god serves the same equivalent purpose. Inspired by this belief, the Smarta tradition followers, along with the five Hindu gods, include a sixth impersonal god in their practice. The tradition has been called by William Jackson as "advaitin, monistic in its outlook".

Āstika (Sanskrit: आस्तिक, IAST: āstika) and nāstika (Sanskrit: नास्तिक, IAST: nāstika) are mutually exclusive terms that modern scholars use to classify the schools of Indian philosophy as well as some Hindu, Buddhist and Jain texts. The various definitions for āstika and nāstika philosophies have been disputed since ancient times, and there is no consensus. One standard distinction, as within ancient- and medieval-era Sanskrit philosophical literature, is that āstika schools accept the Vedas, the ancient texts of India, as fundamentally authoritative, while the nāstika schools do not. However, a separate way of distinguishing the two terms has evolved in current Indian languages like Telugu, Hindi and Bengali, wherein āstika and its derivatives usually mean 'theist', and nāstika and its derivatives denote 'atheism'.

Still, philosophical tradition maintains the earlier distinction, for example, in identifying the school of Sāṃkhya, which is non-theistic (as it does not explicitly affirm the existence of God in its classical formulation), as āstika (Veda-affirming) philosophy, though "God" is often used as an epithet for consciousness (purusha) within its doctrine. Similarly, though Buddhism is considered to be nāstika, Gautama Buddha is considered an avatar of the god Vishnu in some Hindu denominations. Due to its acceptance of the Vedas, āstika philosophy, in the original sense, is often equivalent to Hindu philosophy: philosophy that developed alongside the Hindu religion.

In monotheistic religious belief systems, God is usually viewed as the supreme being, creator, and principal object of faith. In polytheistic belief, a god is "a spirit or being believed to have created, or for controlling some part of the universe or life, for which such a deity is often worshipped". Belief in the existence of at least one deity, who may interact with the world, is called theism.

Conceptions of God vary considerably. Many notable theologians and philosophers have developed arguments for and against the existence of God. Atheism rejects the belief in any deity. Agnosticism is the belief that the existence of God is unknown or unknowable. Some theists view knowledge concerning God as derived from faith. God is often conceived as the greatest entity in existence. God is often believed to be the cause of all things and so is seen as the creator, sustainer, and ruler of the universe. God is often thought of as incorporeal and independent of the material creation, which was initially called pantheism, although church theologians, in attacking pantheism, described pantheism as the belief that God is the material universe itself. God is sometimes seen as omnibenevolent, while deism holds that God is not involved with humanity apart from creation.

Nontheistic religions (not to be confused with atheism) are traditions of thought within a religious context—some otherwise aligned with theism, others not—in which nontheism informs religious beliefs or practices. Nontheism has been applied and plays significant roles in Hinduism, Buddhism, and Jainism. While many approaches to religion exclude nontheism by definition, some inclusive definitions of religion show how religious practice and belief do not depend on the presence of a god or gods. For example, Paul James and Peter Mandaville distinguish between religion and spirituality, but provide a definition of the term that avoids the usual reduction to "religions of the book":

Idolatry is the worship of an idol as though it were a deity. In Abrahamic religions (namely Judaism, Christianity, and Islam) idolatry connotes the worship of something or someone other than the Abrahamic God as if it were God. In these monotheistic religions, idolatry has been considered as the "worship of false gods" and is forbidden by texts such as the Ten Commandments. Other monotheistic religions may apply similar rules.

For instance, the phrase false god is a derogatory term used in Abrahamic religions to indicate cult images or deities of non-Abrahamic Pagan religions, as well as other competing entities or objects to which particular importance is attributed. Conversely, followers of animistic and polytheistic religions may regard the gods of various monotheistic religions as "false gods" because they do not believe that any real deity possesses the properties ascribed by monotheists to their sole deity. Atheists, who do not believe in any deities, do not usually use the term false god even though that would encompass all deities from the atheist viewpoint. Usage of this term is generally limited to theists, who choose to worship some deity or deities, but not others.