The deification or idolization of any scientist, including Albert Einstein, is not a scientifically valid approach. It is important to separate the contributions of a scientist from the person themselves. Einstein made significant contributions to the field of physics, particularly with his theory of relativity, but he was not infallible, nor did he claim to have all the answers.
It is true that Einstein had reservations and disagreements with some aspects of quantum mechanics, particularly its probabilistic nature. However, it is incorrect to say that he was "demonstrably clueless" about quantum mechanics. Einstein played a crucial role in the development of quantum mechanics, and his work on the photoelectric effect, for which he received the Nobel Prize in 1921, helped lay the foundation for quantum theory.
Einstein's theories of relativity and quantum mechanics are not incompatible. While there are open questions and areas of ongoing research in reconciling these two theories at a fundamental level (e.g., the unification of general relativity and quantum mechanics), both theories have been extensively tested and validated through experimental evidence.
In the scientific community, theories are continuously refined and expanded upon through rigorous testing, experimentation, and peer review. Scientific progress is driven by the collective effort of many scientists, building upon each other's work and refining our understanding of the natural world. It is essential to approach science with an open mind, critical thinking, and a willingness to revise and update our understanding based on new evidence and insights.