Two points:

1. Scientific knowledge is expanding at an ever increasing rate. There is the known and accepted scientific envelope and then the speculative envelope populated by hypotheses and models which are undergoing evaluation and testing. It is from this speculative envelope that new known science emerges. Evaluation of speculative hypotheses is very much part of the scientific method. It is not correct to say that science is not addressing pre-big bang physics and the related concepts of the multiverse.  Prior to our current understanding of the motion planets and the sun there were sun gods. This is now archaic. https://en.wikipedia.org/wiki/Multiverse

2. Lets go with your hypothesis that the (Christian and not any other) God created the Universe for humanity. The known Universe which is 13.6 billion years old contains more than 100 billion galaxies each containing 100's of billions of stars. To assume that man was the endpoint of this endeavour is anthropomorphic narcissism.