It requires fewer miracles to believe that it has always existed. Alternating between long quiescent periods of waiting in space as mere wispy potential and eventual emergence on planets everywhere, life may have always been. If the physical universe begins with a cosmological big bang, the potential for the big bang had to exist already. With or without a beginning, the physical world is a miracle. Life seems the same way.
Life is a miracle, too.
If life has lasted since forever, that would imply that it will last forevermore. So even if life on our own planet were to expire before we became Cosmic Ancestors, somewhere, probably, life will continue. The progress of science has had a humbling effect before, as when we found out that we are descended from lower animals. It was humbling for people to learn that the earth goes around the sun, that there are other planets, other suns, other galaxies, now maybe other universes. By Cosmic Ancestry, we're connected to the whole.