The fact that time progresses doesn't mean that it has a starting point. It could be infinite.
Even if this universe isn't infinite, that doesn't mean that it couldn't exist within an infinite multiverse.
However, if our universe is but one within an endless multiverse with it's own time, then that multiverse could create our universe.
Or, maybe our universe did create itself using time travelers.
Citation needed.
You can't just jump from "a cause is necessary" to "therefore that cause has to be a single intelligent being, and it happens to be my God." Perhaps the universe was the natural product of unintelligent
colliding branes within a multiverse. Or maybe we're all in a
computer simulation created by many beings similar to ourselves.
There are lots of possible explanations, but regardless, I don't see any objective evidence that can only/best be explained by the existence of deities, so until I do I'm disinclined to believe that they exist.