Atheism is, in point if fact, a world view.

There is a world. You have a perspective on that world. The assumptions you make and the things you believe, rational and irrational, are a world view. The concept that there is (or is not) credible evidence that gods, or planets, or whatever fundamental facets of existence, imaginary or otherwise, are either a world view themselves or are deeply rooted in your world view.

Q: does your world include unicorns? A: i don’t know.

The answer stems from having a world view that does not categorically include nor exclude unicorns. But more to the point, when answering questions like:

Q: what is most likely the source of existence? A: <anything you damned well please>

The answer, if actually responding to the question, is a world view, or deeply tied to a world view.

As to forms: forms are often limiting and don’t include information we consider relevant, or do include information we consider irrelevant. So it goes. In any case, they would ask that information precisely because world views provide broad but effective indicators about an individual. Knowing that a large incoming group of hotel guests is Christian, for example, can be a useful metric, because you’ll know that your hotel will make above-average pay-to-watch porn sales that weekend.