Well, our particular genetic make-up is what makes us human to the extent that we are enabled to engage in activities that we differentiate from other species as uniquely human endeavors. Thoughts, emotions, the need for interaction with other human beings. People may express themselves in a variety of ways, some greater than others due to however their brain has developed. But the ontology of "human-ness" I would say can be defined on compatible levels of abstraction, from one's close genetic relation to others of the same species, to the activities and experiences they share, even when they range in degrees on any given particular comparison.
He who loves God cannot endeavour that God should love him in return - Baruch Spinoza
