God created the universe. This is the best and only logical explanation for how we came into existence.
If God did not do it, then who or what did? There are only two possibilities. A Creator. Or it created itself. Nothing physical can create itself.
The universe was a work of art and it had an artist not some two year old who was playing with crayons and scribbling all over and created something great and amazing (big band theory) but God is an artist.
Causation could not occur before spacetime.
Believers must be able to present a model of the universe in which some god is "either required, productive, or useful." There is nothing wrong with not knowing, but saying you know, when no one knows, is pure arrogance.