"There is a god because e = mc²"

[Pat Mustard]

An apologist friend of mine said this a while back and I thought I'd pose the question here. He says, there is a god, because e=mc².

Any clue what he could be talking about? Or where he could have gotten this idea?

I wish I could say I was adept at mathematics and physics, but I am not.

But I recall someone of my acquaintance, who is both very scientific but also a theist,
observing that the second law of thermodynamics dictates something to the effect that
entropy succeeds over time; everything winds down, like a clock, including the Universe

...and that raises the interesting question about who wound the clock up, in the first place...

But I'm way out of my depth with it, sadly.

That's just a rephrase of the Uncaused Causer argument of Aquinas, and it fails on "who created the creator?" just as surely.