What is dark matter? What is drk energy? We don’t know. Hypotheses of their nature have failed. The search is still going on, but it may take a while. All we really know is that something is making stars in galaxies move faster than they should, and something is causing the expansion of the universe to speed up instead of slowing down. These are the results of observation, not of experiment. We also observe “miracles,” events that appear to run counter to the laws of physics, chemistry, biology, etc. We cannot dismiss observational evidence. Dark matter and dark energy are also the results of observation.
similarly, we observe miracles which seem to be due to the intgerdcession of particularly virtuous persons who have died. This is evidence that human beings somehow persist after the death of the body. Those who insist that the physical world is all there is dismiss evidence of miracles and life after death because it does not fit their frame of thought.