This is like trying to explain a homerun with the rules of football. I'll say it again, cause and effect did not begin until within the first second of the universe's expansion. Please explain to me how what happens afterwards determines what came before.
Space seems flat which allows us to exist in the form we percieve. As spacetime approaches a singularity it curves until it reduces to a point. Moving away from a singularity it expands and flattens.
God (presumably) and the singularity were present before the universe. There is no cause and effect before the universe. At best we could say they were together in the singularity.