My irreligion inspires me, activates my humanitarian instincts, makes me happy, reconciles me to my human nature, mortality, cosmic insignificance etc. etc. AND, I want to share all that with the religiously-benighted world.
Does my impulse to share make me no better than a proselytizing missionary, desperately seeking personal/ideological validation through tribal association?
Maybe. It certainly makes me human.
(See the whole Oatmeal cartoon here.)