MACON, Ga. — Bill Underwood, interim president of Baylor University in Waco, Texas, was elected president of Mercer University Dec. 2, promising to retain the Macon, Ga., school’s historic Baptist identity despite a recent break with the Georgia Baptist Convention. “I’m a Baptist,” Underwood, the longtime Baylor law professor, told Associated Baptist Press (ABP). “And I am committed to Mercer…