The Big Bang theory is a scientific explanation for the origin and development of the universe. It is based on extensive observational and theoretical evidence gathered by cosmologists over many years. Faith, in the religious sense, typically involves belief in something without or beyond empirical evidence. In the case of the Big Bang, belief in this scientific theory does not require faith in the religious sense because it is supported by a large body of scientific evidence.
The Big Bang theory is supported by various lines of evidence, including the observed expansion of the universe, the cosmic microwave background radiation, the abundance of light elements, and the large-scale structure of the universe. These pieces of evidence, along with mathematical models and physical principles, form the basis for our understanding of the Big Bang.
However, it's worth noting that individual interpretations of scientific theories can vary, and some people may incorporate their religious or philosophical beliefs into their understanding of the Big Bang or other scientific concepts. In such cases, faith may play a role in how they reconcile scientific explanations with their personal beliefs. But from a purely scientific perspective, belief in the Big Bang theory is based on empirical evidence rather than faith.