First, if you want to explain the existence of the world, explaining it by assuming a creator does not solve the problem since you still have to explain the existence of the creator.
Then, if there is no need to explain the existence of a creator, then why would there be a need to explain the existence of the world?
Still, if you want to say that a creator is different, then you need to explain how you could know anything about it. Maybe our universe has been created by a creator which is just yet another dumb universe.
And, the argument that everything has a cause is wrong, but if it was true, then it would apply to the creator itself and so you would need to explain the creation of the creator.
This argument that everything has a cause is wrong essentially because it assumes that we know reality, when in fact while we know a part of it we certainly don't know whether what we know is the whole of reality. Thus, even if it was true that everything in the known universe had a cause, it would still be possible that things outside the known universe had no cause. In fact, this would not even imply that the universe itself would have to have a cause since, physically speaking, the universe is not in the universe, and only possibly in something larger.
Science is investigating as far back as possible consistent with logic and fact. That in itself means diddly squat about what would have existed before, or indeed whether anything existed prior to that.
The logical fallacy is to pretend that such beliefs as first cause and creation are logically necessary when they are not.
Sometimes, it is enough to admit that we don't know and probably will never know, and that we don't understand and probably will never understand.
Of course, we may still want to investigate. If you want to investigate whether there is a God that created the universe, why not, but it is still fallacious to claim that a creator is necessary to explain the creation of the universe because, in fact, you don't know that the universe had to be created to begin with.