Scientific theories must always be tested experimentally. An electron orbital is a region in space where there is the greatest likelihood of finding an electron. The nature of scientific knowledge and the procedures for generating new scientific knowledge are unique and different from those in other fields of knowledge such as philosophy. Compare the methods used for weather forecasting by meteorologists and those used by the people producing the forecasts for the Farmer's Almanac. Compare Galileo's experimental approach to investigating the rate at which heavy and light objects fall and Aristotle's approach, based on reason alone.
Scientific knowledge is subject to change.
It does not claim to be truth in an absolute and final sense. This does not lessen the value of knowledge for the scientifically literate person. Our understanding of atomic structure has changed considerably for this reason. Scientific knowledge is a product of humankind. It involves creative imagination.