Final answer:
The question asks for a specific percentage not provided in the provided information. Trends from Pew Research Center studies suggest a complexity in Americans' religious and spiritual identities, implying a potential need for social worker skills in these areas.
Step-by-step explanation:
The question does not provide a specific percentage of NASW (National Association of Social Workers) members who stated that workers do not have the skill to assist clients in religious and spiritual matters. However, the information given touches on the complexities that social workers may face when addressing spirituality and religion with their clients. With a significant number of Americans identifying as both religious and spiritual or as nones—those with no religious affiliation—it is likely that a study on this subject would reveal a range of preparedness among social workers.
National surveys conducted by the Pew Research Center highlight the nuanced relationship that many Americans have with religion and spirituality. A notable trend is the increase in the number of Americans who define themselves as spiritual rather than religious and the growth of the 'nones'—people with no religious affiliation. These shifts in religious and spiritual identification may suggest implications for social work practice and the need for social workers to be adept in this area. Yet, without the specific statistics from the NASW study, it can only be inferred that this is a professional development area that may require attention.