It's OK for modern thinkers to use archaic terms if we can show the term has use in our contemporary scientific world.
Science tries to explain the behavior of "things" (including animals). The latin word "anima" means spirit or breath. Ancient man was also scientific in orientation. Ancient man just didn't have enough "information". So he imagined some invisible force (breathlike, windlike) that moved or "animated" things. Another name for this type of belief is "animism". Modern religion tends to look down on this belief as being childish. Disney has made a fortune on the idea that tea pots, clocks and rocks can be brought to life.
The concept of "spirtuality" emerges from this background and it becomes the stew-pot for all the invisible stuff behind and in the "material" stuff. Because of this we have the dichotomy Spiritual-Material
To the modern thinker there IS something very important that isn't "material". INFORMATION.
Happy is the man conscious of his need for INFORMATION. Just as ancient man saw that there is more than meets the "eye" modern man seeks to accumulate knowledge and information NOT just "material".
Modern thinkers also have something similar to FAITH. They have induction.
Wikipedia defines induction: " Induction or inductive reasoning, sometimes called inductive logic, is the process of reasoning in which the conclusion of an argument is very likely to be true, but not certain, given the premises. It is to ascribe properties or relations to types based on limited observations of particular tokens; or to formulate laws based on limited observations of recurring phenomenal patterns."
Which is more likely? Redfining "spiritual" as "information" or abandoning the term "spiritual" altogether?