The Great Awakening had a tremendous impact on American religious and cultural life.
In the area of religion, the Great Awakening led to splits in many of the major Protestant denominations. Churches like the Presbyterians and the Congregationalists split between factions that did and did not support the Great Awakening and its ideas. In the area of culture, the Great Awakening major impact was that it helped to create a sense of solidarity among the colonies. It provided the different colonies with a common religious experience to replace the differences that had been felt because of each colony having a different established church.
In an odd way, then, the Great Awakening helped to split religious denominations (at least temporarily) but also helped to unite the colonies because it gave them something in common that they had not had before.