Scientists have stepped out in faith since science was created. Hypotheses lead to theories which lead to laws. The scientific method often leads to a point where the educated "guess" how the gaps are filled in. Atheists and theists alike have to adjust based on evidence. Most scholars today have come to the conclusion that the universe had a beginning. The argument made today focuses on that evidence. Cosmologically, anything that begins to exist had a beginning. This universe began to exist at some point. Therefore, the universe had a cause. We believe that God is the cause.