Talk about a full circle moment. Kirk and Kirklyn Johnson were diagnosed with non-verbal autism at just 3 years old. Doctors told their parents, Shae and Stan Johnson, that their sons might never speak. But Shae and Stan weren’t having it. Instead they leaned on their faith, speech therapy, early intervention, and lots of music, Mississippi State University reports. Where words failed to form, melody did. Over time, that became the language Kirk…