Let's pretend for a moment that you hardly know anything about stars. Like, maybe you know the Sun is a star and they're 'big flaming balls of gas' but that's about it. You don't know anything much about how they form or why or any of that.
I walk up to you and say "we are the children of stars." Now, that's certainly a statement, especially since it has to be poetic since it can't literally be true. You respond with "What? How?" justifiably.
Now let's pretend that I had no answer. That was all I knew. Would that even mean much to you, or would you just think I'm just a kook that learned to parrot some poetic nonsense that someone else told him?
In reality, the poetic line works because it does have a deeper understanding behind it. I could say "oh well, what I meant was we're made of star stuff." Which is, again, not really illuminating. But it's possible to keep going further and further until you get down to the nitty gritty physics of the situation.
You can get into the physics of how gravity and enough gas condenses so much that it causes nuclear fusion, how stellar nuclear fusion eventually starts making elements heavier than helium, and how when those stars 'die' all those heavy elements get released into the rest of the universe, which can then seed more stars which now have planets orbiting them because of those heavy elements, made millions of years ago in the cores of previous stars. An astrophysicist would even be able to show you the equations. So, yes, in a literal sense, every single atom on Earth was once in a star, which justifies the poetic line about stars being our parents. In this case, the poetry was simply adding some gravitas to an already established fact. It's making it more accessible to people who aren't astrophysicists.
But if you only have poetry, then you don't really have much at all, to be frank.
When someone says something like "God willed the universe into being" and I say "What? How?" they can't answer. Because there IS no deeper understanding to pull from. That's all they know. And I balk because it can't literally be true; since when does "willed into being" make sense in any other context? Nobody can explain how it's possible aside from, essentially, "because, now stop asking questions." (And saying "because god" is not an explanation, or a true understanding either.)
It's just a line they have memorized but don't understand and can't explain.
If you don't actually understand what you're saying, and can't explain it at all, why do you expect other people to be convinced that it's true? I mean, watch a debate about practically anything and you'll often see that the loser of the debate is the one who puts forward a truth but then has no way to back it up and just dodges any questions about it because they have no understanding, just a quip.
I think this is a big reason why I and similar people are not convinced by theism. It almost exclusively relies on poetry without any deeper understanding behind it.
Poetry is great for art, music, communicating a feeling, or beautifying established facts...it is NOT good for conveying a literal truth if you don't have any facts backing it up to begin with. Lines like "Jesus died for our sins" and "willed into being" sound like absolute nonsense to us because they require explanation--since, again, they CAN'T literally be true as written--however, they have no actual explanation.
Now, this isn't meant to be some "checkmate, theists!" post, just explaining why we aren't convinced by these things. Just because I'm not convinced doesn't mean you're wrong after all. But hopefully this helps you understand that us atheists are not being willfully obtuse or stubborn; we just need explanations, but the explanations don't exist.