A quick Google search would've told Sam that not all those opposed to ESC research on ethical grounds is religious, and not all atheists are utilitarians.
After WWII, Germany split into two. Is this one nation becoming two? Even later, Germany merged into one nation. What happened to the extra nation?
Therefore, Germany was never a country.
Harris is positing that souls, entities he does not even believe in, cannot merge and fuse like cells. Why?