The Big Bang itself is a scientific theory and as such stands or falls by its agreement with observations. However, as a theory which addresses the nature of the universe since its earliest discernible existence, the Big Bang carries possible theological implications regarding the concept of creation out of nothing. Many atheist philosophers have argued against the idea of the Universe having a beginning – the Universe might simply have existed for all eternity, but with the emerging evidence of the Big Bang theory, many theologians and physicists have viewed it as implicating theism; a popular philosophical argument for the existence of God known as the Kalam cosmological argument rests in the concepts of the Big Bang. In the 1920s and 1930s, almost every major cosmologist preferred an eternal steady state universe, and several complained that the beginning of time implied by the Big Bang imported religious concepts into physics; this objection was later repeated by supporters of the steady-state theory, who rejected the implication that the universe had a beginning.
Hinduism
The view from the HinduPuranas is that of an eternal universe cosmology, in which time has no absolute beginning, but rather is infinite and cyclic, rather than a universe which originated from a Big Bang. However, the Encyclopædia of Hinduism, referencing Katha Upanishad 2:20, states that the Big Bang theory reminds humanity that everything came from the Brahman which is "subtler than the atom, greater than the greatest." It consists of several "Big Bangs" and "Big Crunches" following each other in a cyclical manner. The Nasadiya Sukta, the Hymn of Creation in the Rigveda, mentions the world beginning from a point or bindu through the power of heat. This can be seen as corresponding to the Big Bang theory. Several prominent modern scientists have remarked that Hinduism is the only religion in all of recorded history, that has timescales and theories in astronomy, that appear to correspond to those of modern scientific cosmology, e.g. Carl Sagan, Niels Bohr, Erwin Schrödinger, Werner Heisenberg, Robert Oppenheimer, George Sudarshan, Fritjof Capra etc.
Bahá’u’lláh, the founder of the Bahá’í Faith, has taught that the universe has "neither beginning nor ending". In the Tablet of Wisdom. Bahá'u'lláh states: “That which hath been in existence had existed before, but not in the form thou seest today. The world of existence came into being through the heat generated from the interaction between the active force and that which is its recipient. These two are the same, yet they are different.” The terminology used here refers to ancient Greek and Islamic philosophy. In an early text, Bahá’u’lláh describes the successive creation of the four natures heat and cold, dryness and moisture, and the four elements fire, air, water and earth. About the phrase "That which hath been in existence had existed before, but not in the form thou seest today," 'Abdu'l-Bahá has stated that it means that the universe is evolving. He also states that "the substance and primary matter of contingent beings is the ethereal power, which is invisible and only known through its effects... Ethereal matter is itself both the active force and the recipient... it is the sign of the Primal Will in the phenomenal world... The ethereal matter is, therefore, the cause, since light, heat, and electricity appear from it. It is also the effect, for as vibrations take place in it, they become visible...". Jean-Marc Lepain, Robin Mihrshahi, Dale E. Lehman and Julio Savi suggest a possible relation of this statement with the Big Bang theory.