I am not sure if you understand either Science or Monism. Science is the best way to understand the world around us. Science can never be monistic by its very nature. What is monism? Monism is saying there is only one reality, the nature of which is sat chit ananda. Science never claims itself to have those attributes (worse monists claim that this reality is attributeless). Those physicists who are researching a unified field have to understand there are 2 things in the picture 1) A Scientist
2) The field they are trying to research
The above can only be dualistic by the very nature of it. If a scientist says reality of the world is a fiction of your mind, then his very assertion (that reality of matter is a fiction of your mind) is itself a fiction of his mind. So there is no credibility of him using science to explain reality (which monism says cannot be explained, again a huge self-contradiction). In effect, science also becomes a mind made reality which is unreal. Such a person is not a scientist but is misusing science to align with his agenda.
Albert Einstein has been oft misquoted. But in vain. He never ever concurred with a Monistic theory. Those who quote him do not realize what he contributed to the world. A quote lifted from a speech can easily be conveyed incorrectly if viewed without the context. Hence context is important. Many of the people who cite Einstein on religion will not be able to tell what Einstein wrote in a telegram to Rabbi Herbert Goldstein and what Einstein's statements were on God. Many idiots quote the following statement of Einstein "God does not play dice with Universe", but will not be able to explain the context in which it was made or when it was made and where and Neils Bohr's retort to it. Here's a quote from Einstein:
"Those who are purposely insular in order to convince like-minded individuals to believe in the supernatural are frustrating but not overtly sinister. It is the defamation of scientific iconoclasts which is unacceptable."
So it is a lame way for the monist to use science. He or she is just misusing science to explain in a rational way because of the lack of rationality in the monistic philosophy.