Don't we know the origin of life? It was born. We know the life we are descended from, all life is descended from, is at least 3.7 billion years old. We trace it back but lose track of it in the hot earth. For all we know it came out of the big bang, or at least the propensity for it to emerge came out of the big bang. Consider that the universe itself is living. If it is living, it was born, if it was born, it resembles it's parents. Thus, one scenario is that the universe was born as a function of the interaction of other physically existing living universes like our own.