The title of the Sunday morning sermon was to be “A Love That Forgives.” That was the message 14-year-old Carolyn Maull McKinstry anticipated hearing from John H. Cross on Sept. 15, 1963, at Sixteenth Street Baptist Church in Birmingham. But the sermon was never delivered. Instead, at 10:22 a.m., a homemade bomb placed outside the church by Ku Klux Klan…