Final answer:
The Social Gospel Movement, influenced by minister Charles Sheldon's question 'What would Jesus do?', aimed to address social issues like poverty using Christian ethics and inspired a rise in charitable efforts.
Step-by-step explanation:
The Christian grassroots movement you're referring to is likely the Social Gospel Movement, which emerged in the early twentieth century. This movement sought to apply the teachings and principles of Christianity to solve widespread social issues like poverty, crime, and child labor. It was heavily influenced by the work of minister Charles Sheldon, particularly his novel In His Steps, which encouraged followers to consider 'What would Jesus do?' as a guide for their daily actions and decisions. The Social Gospel Movement played a significant role in promoting a renaissance in charitable efforts and underlining that service to the poor is an obligation for those blessed with wealth. Moreover, organizations like the YMCA and the Salvation Army gained recognition for their commitment to charitable work influenced by this movement.