Deep Cuts: athena.php

I would like to add a div inside the athena.php document so I can alter the home page. I can’t figure out how to do it in my child theme. I created the path inc > athena > athena.php (athena.php is a copy from the parent theme) in my child theme to mimic what is in the parent theme, but no changes show. They only show when I make them in the parent theme. Thanks for any help.