All good criticism should be judged the way art is. You shouldn't read it the way you read history or science.
Of course, supernatural acts are what miracles are all about. They are, after all, precisely those things that circumvent the laws of nature. A god who can create the laws of nature can presumably also circumvent them at will. Although why they would have been circumvented so liberally thousands of years ago, before the invention of modern communication instruments that could have recorded them, and not today, is still something to wonder about.
And evolution or God or whatever arranged things genetically, to keep the little families going, to cheer them up, so that they could all have somebody to tell stories around the campfire at night, and somebody else to paint pictures on the walls of caves, and somebody else who wasn't afraid of anything and so on.
I have frequently seen people become neurotic when they content themselves with inadequate or wrong answers to the questions of life. They seek position, marriage, reputation, outward success of money, and remain unhappy and neurotic even when they have attained what they were seeking. Such people are usually confined within too narrow a spiritual horizon. Their life has not sufficient content, sufficient meaning. If they are enabled to develop into more spacious personalities, the neurosis generally disappears.
It was too perfect to last,' so I am tempted to say of our marriage. But it can be meant in two ways. It may be grimly pessimistic - as if God no sooner saw two of His creatures happy than He stopped it ('None of that here!'). As if He were like the Hostess at the sherry-party who separates two guests the moment they show signs of having got into a real conversation. But it could also mean 'This had reached its proper perfection. This had become what it had in it to be. Therefore of course it would not be prolonged.' As if God said, 'Good; you have mastered that exercise. I am very pleased with it. And now you are ready to go on to the next.