There is no evidence to suggest that Albert Einstein was angry or frustrated during the last days of his life because he was unable to prove the non-existence of God or establish that the universe was solely created by natural processes. It is important to note that Einstein's views on religion and the existence of God were nuanced and evolved over time.
Einstein's religious and philosophical beliefs were characterized by a sense of wonder and awe for the natural world. While he rejected traditional organized religion and the concept of a personal God, he often expressed admiration for the beauty and harmony of the universe. Einstein saw the laws of nature as a profound source of wonder and described his religious feelings as a deep emotional connection with the mysteries of the cosmos.
Einstein's scientific work focused on understanding the laws of physics and uncovering the workings of the universe. However, he recognized the limitations of science when it came to addressing metaphysical or philosophical questions, such as the ultimate origin of the universe or the existence of a divine creator. He believed that science and religion occupied separate realms of human experience and should not be seen as conflicting or mutually exclusive.
Therefore, it would be inaccurate to assert that Einstein was driven by a personal frustration or anger related to proving or disproving the existence of God or the origin of the universe through scientific means. Einstein's approach to these questions was more contemplative and philosophical, emphasizing the harmony and beauty he found in the natural world.