Atheism, as a broad term, refers to the lack of belief in a god or gods. It doesn't necessarily imply a specific belief about the origin or purpose of the world or universe. Atheists may have different views on cosmology, metaphysics, and the nature of existence.
Some atheists may hold naturalistic or scientific explanations for the origin of the universe, such as the Big Bang theory or theories based on multiverse concepts. These explanations propose that the universe came into being through natural processes and don't invoke the need for a supernatural creator or purpose.
However, it's important to note that atheism itself is simply a position on the existence of deities and doesn't dictate any specific beliefs about the origin or purpose of the world. Atheists can have diverse perspectives on these topics, ranging from embracing scientific explanations to holding philosophical or existential views about the nature of reality.
It's also worth mentioning that atheism doesn't necessarily imply that life lacks meaning or purpose. Many atheists find meaning and purpose in various aspects of human experience, such as relationships, personal achievements, contributions to society, and the pursuit of knowledge and understanding. The absence of a belief in a higher power doesn't preclude finding meaning and fulfillment in life.