Which philosopher discussed the idea that the universe "just is" in opposition to the necessity of a creator?

The philosopher who discussed the idea that the universe "just is," opposing the necessity of a creator, is Bertrand Russell. In his work, particularly in "Why I Am Not a Christian," Russell challenges traditional arguments for the existence of God, particularly the cosmological argument, which posits that everything must have a cause. Instead, he suggests that the universe itself could be a brute fact—an entity that exists without the need for an explanation or a creator behind it. This perspective expresses a view that reality does not require a divine being to make sense of its existence, arguing instead for a more naturalistic understanding of the universe. By suggesting that the universe simply exists as a starting point, Russell offers a significant philosophical position that critiques the need for a creator and supports a self-existing, inherent nature of the cosmos.