That theory is now generally accepted, and scientists are looking for trails of energy left behind from the colossal explosion that created a trillion stars. Yet there is no absolute proof. But the creation of the universe is something too big to happen so simply.
Religious folks will say God/Allah/Vishnu created the universe. But scientists will say that there was a Big Bang, and that there is energy from the bang moving through the universe, and they are trying to locate the epicentre. So, the debate continues.
But what is science? And math? Things created by man. So before saying that man created God and science proves it, people should realize man created science as well. And maybe, the universe is just something made up in our minds.