Merrill's decision to become a Baptist in 1804 was both an effect and a cause of tectonic shifts in the young Republic's social and religious landscape, including disestablishment, which toppled the power structures of New England's Standing Order. Disagreement over baptism was a constant source of conflict, yet Merrill and Fisher continued to focus their energies and attention toward familiar endeavors, shared under the broader evangelical umbrella.
Both were characteristically active evangelicals, engaged in a wide array of causes from circuit preaching to temperance and the formation of Bible societies. The mistreatment of black slaves and indigenous peoples were evils which they confronted through preaching, in print, and advocacy. Each contributed to the founding of educational institutions, some of which continue to the present. As "Fathers," they shaped the communities they served in ways that would extend past their lifetimes, and to regions far beyond New England.