The origin of life continues to amaze me. Even if we have created the simplest building blocks of life in a test tube, these only constitute basic amino acids. Making the leap to proteins and simple cell creatures from these basic particles would be similar to continually blowing up a pile of bricks and trying to make a house. Yes, perhaps an infinite amount of time might get you there, but even infinity would not be long enough based on probability.
Divine intervention? Not sure about that.
Finding even the crudest form of life on another planet would prove that given enough time, life happens.