When the Homily is about Immunology

BEING
American Heritage
1. To exist in actuality; have life or reality.

Hmmmm...
Do I, as a human BEING, live up to my title? Do I exist in actuality, or do I chose to exist in unreality - where it is so much more comfortable?
For some reason it also makes me think of protestant ecclesiology. Does the Church exist in actuality?