One of the big scientific questions is how life began on earth. Many scientists are now agreed that life is almost certain to have originated out of simpler, chemical compounds. Further, that this is practically inevitable given the early conditions on earth. This isn’t about faith, but the evidence that has been accumulated.
Since the Miller experiments of the 1950s, the application of the principles of chemistry and physics to this problem has shown that nearly all the components of a simple-cell can and do form naturally.