[Theo]

Yup.

On the very first day God created only one thing: light.

That was it. Just light.

And he separated that light (matter?) from the darkness (anti-matter?).

Sounds to me like that was the foundation for everything that followed.

[Colinsky]

On the very first day God created only one thing: light.

In the Beginning, there was nothing.
And then God said, "Let there be light."
And there was still nothing, but now you could see it.