Existence of God is indeed related to cosmic evolution depending on how you define god. That is why scientists are conducting a experiment in Europe to understand how a universe came into existence from a singularity.
At this point in time big bang is just a theory and no one knows what happened during big bang. I read a recent news that all the stars came into existence 150 millions to 200 millions before what scientists had predicted.
Now the question is since we are bound to 4 dimensions only and can visually experience 3D only,are there any form of life that live in higher dimension? if so they might be God for us and our universe might be one of the model created by the intelligent beings from the higher dimensions.