In many ways, the young gunmen who shattered families and broke the hearts of metro Atlanta and Boulder, Colorado, in separate, high-profile killing sprees represented very different variations on the American story. In the sprawling exurbs north of Atlanta, the alleged March 16 mass killer of eight people — six of them women of Asian descent who worked in spas — grew up deeply connected to the fundamentalist Christian church, and was seemingly unable to reconcile his years of Sunday school with the pornography he frequently watched, fueling his belief — apparently endorsed by his religious pa…