Undeniably the term Feng Shui has been abused in recent years. Here I am referring to both yin and yang house Feng Shui, particularly the latter.
The scholarly term of Feng Shui is Kan Yu 堪輿 which means the way of Heaven and Earth.
We can loosely connect wind to Heaven and water to Earth. We can say that Kan Yu is the study of the way of living in harmony in a certain space at the current time.
The basis of the study and practice is that qi 氣 comes to a house according to the orientation of the house and the location of mountains (walls) and waters (doors and windows). It is about the approach of yang qi towards yin qi and the characteristics of the embryo formed as a result of the intercourse. These characteristics change with time. These characteristics also change with the environment. The environment includes the forms outside and inside the house.
By the forms we mean the mountains and waters, the buildings and the roads. the partitioning walls, large objects and the interior pathways, doors and windows inside the house. These affect the characteristics of the qi coming into a house. These also affect the qi generated in the mnds of the occupants.
Religious beliefs and shamantic practices that have no relationship with the environment should be excluded from the Feng Shui realm. No one has the right or authority to define what is and what is not Feng Shui just in the same way as to define what is and what is not Science (remembering that it comes from the Lation word "scientia" meaning "knowledge"). However, we must respect the origin of the term and the way the knowledge is developed through time. At times, the development may be led to the wrong path and it is our responsibility to bring it back on track. The path should not depart from the study of environment and its changes with time.