This applies to everything, including the currently “accepted” scientific theory that all matter and energy that exists today ultimately arose from nothing.
Maybe it did, maybe it didn't. All we can do is look at what we can see and try to make sense of it. That's what we do and what would we do if we didn't do that?
Which is not any more sound that God creating everything from nothing.
So why do scientists mock the idea that a creator created everything from nothing and then with a straight face, expect us to believe that everything arose from nothing all on its own?
Wouldn’t a “creator” or “designer” had to have arisen from nothing at some point? Or did he/she themselves have a creator - if so, where did he/she come from? And if one argues that a “designer” is timeless and had no beginning, you are admitting there are eternal things, so why not save a step and say the universe itself (certainly less complex than whoever “designed” it) is itself eternal and didn’t require designing? The easiest answer to all this mess: most people desperately want there to be a higher intellegence (mostly because they want to survive death), and look for ways to justify it. Which is fine and good - but it’s not science.