I should preface this by saying I am not a scientist , I just find this stuff interesting . I wouldn ' t say you are blindly trusting them , because their conclusions regarding the big bang are based on empirical science , meaning it can be examined and tested by other people in reality . The empirical evidence they present , reviewed and upheld by the majority of experts in their field , gives you a justifiable reason to trust that they have a reasonable explanation for what we observe about the universe . The other cool thing about science is that theories like the big bang aren ' t just explanations that don ' t do anything they also make predictions about what we should expect to find if those ideas are actually true . For example , one prediction of the big bang model was that there should be radiation coming at us from all sides , that was once about 3000 degrees Kelvin and should now be about 3 degrees Kelvin . And when they checked to see if that would hold true , that ' s exactly what they found a verifiable prediction drawn from a scientific model based on empirical evidence gathered from the universe as we observed it to be . And , if that hadn ' t been the case when they looked , they would have called the whole big bang theory into question right then and there , and started looking for a better model . The difference with religion is this there may be religious experts theologians and the like who are the socalled authorities in their field , but we don ' t take them seriously because the claims they make are not based on empirical data or observations of the universe . They are instead based on stories and traditions and assumptions . They deal in absolute , unchangeable truths , which science does not . They refuse to admit the possibility of being incorrect , which science goes out of it ' s way to allow for . Religion is constantly trying to prove itself right , while science is constantly trying to prove itself wrong . Only one of those two methods for discovering truth actually allows for movement towards a better and more correct model of reality . It may actually be a belief to say that the big bang happened . But it is a justifiable belief , because the evidence demonstrates that it did happen . That isn ' t the same as a religious belief , where faith is required as the justification because there is no evidence to demonstrate the truth of the claims .