Of the Models of Wellness, many contain a spiritual component - most often as a "primary" component, alongside physical, social and perhaps many more components (eg mental is divided into two or more primary components, such as emotional wellness and intellectual wellness).
The inclusion of spirituality* as a component of wellness, most especially as a stand-alone primary component of wellness, implies one must be spiritual to be well. In other words, the lack of spirituality - similar to the lack of any other aspect of wellness, such as healthy eating, suggests the individual is less well - other factors being equal, of course.
*The models that include spirituality as a dimension of wellness ask questions about an individual's spirituality, makes recommendations as to how to be "more" spiritual if one scores low in spirituality, etc. Basically the same items they include for other components of wellness, such as the primary component of physical wellness (which is often described to include healthy eating, regular physical activity, etc.).
The obvious problem with including spirituality as a component of a wellness model is approximately 7% of US Americans are atheists (and the percent is much high in certain other countries, such as France) and for simplicity of discussion, are not at all spiritual. Because of this, I contend spirituality is an "OPTIONAL sub-component of the mental dimension.
So, I believe spirituality is not and can not be a "required" component of wellness, but is an "optional" sub-component of mental wellness. Do you agree or disagree? Why? Do you know of any research in this area?
As an aside, my construct of a model of wellness includes only three primary components: Physical, Mental, and Social. As suggested by the World Health Organization (WHO) Constitution's (1947) definition of health as being composed of three primary components: Physical, Mental, and Social. Further, that all other dimensions or aspects of wellness that can possibly be conceived / suggested are sub-components of one of the three primary components. For example, I support Halbert Dunn's (1961) suggestion that family wellness is a type of social wellness.
Thank you!