Why does anything exist at all?

The best we can imagine of ‘nothingness’ is probably a dark, empty, infinite and pitch-black void of emptiness.

But even THAT is something: empty space, the passage of time, infinite eternal darkness.

So seeing nothingness is more like what we see through our toes when our shoes are on, rather than what we see with our eyes closed. So how did anything ever get started? Even the Big Bang requires gravity and some form of energy just to get the space/time continuum started.

And, some will say, its because God created it all. Yes, I understand that God is the creator of time and space, and that God didn’t come from anywhere or have an origin, because God created time and God created every place that God could come from. But how, or why, then, does God exist?

In this vein of thought, did God just ‘happen’ to exist? Couldn’t God, therefore, just as easily never existed ? Couldn’t ANY first cause just as easily have never existed—and there could have just as easily never been anything at all?

Can we even contemplate ‘nothingness’ ?