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It isn't. It is a theory. There are many theories of what the universe is and how it started. So far, like all theories, it is not absolute fact. But for those

• s_q_b 10y ago
  No. In scientific discourse a "theory" is a framework of ideas that aligns with existing known facts, and can be used to make future predictions. To the extent that additional facts fit a theory, that theory becomes stronger or more established. This is because the additional evidence makes the theory more likely to be true. The most powerful evidence in favor of a theory is when it accurately and precisely predicts future events. The Big Bang is a very strongly established scientific theory. For example, the cosmic microwave background radiation is exactly where the theory says it should be. As for your remarks about religion... Religion is a serious topic. It involves dimensions of human interaction, discussion, and philosophy. It is far more complex than your reductionist comment. Belief in a creator God is far more than binary, and many great scientists and theologians have struggled with these very issues, and no one yet has an entirely satisfactory answer. I can, however, confidently say that, unless God has a very very strange sense of humor, the Big Bang occurred, the Earth slowly formed over billions of years, life arose from the primordial chemical environment, first as a single celled organisms, and eventually leading to animals, mammals, primates, and us.