Atheism, as a broad term, refers to the lack of belief in a god or gods. It doesn't necessarily entail a specific belief about the origins of the universe. Atheists can hold various views on the origin of the universe, ranging from scientific explanations like the Big Bang theory to philosophical hypotheses like the multiverse theory.
It's important to note that atheism doesn't require atheists to provide an answer to the question of who or what created the universe. Atheism simply deals with the absence of belief in a deity or deities. Atheists may find satisfaction in acknowledging that the question of the universe's origin is still an open area of scientific inquiry, and they may appreciate the ongoing pursuit of knowledge and understanding in fields like cosmology and astrophysics.
It's worth mentioning that attributing the creation of the universe to a specific entity, such as a god, is a matter of personal belief and falls into the realm of theology or individual philosophical perspectives. Atheism, on the other hand, is primarily concerned with the absence of belief in such entities.