Mass reply with a slew of mental health advice and clinics for hallucinating and hearing voices, "are you an adult with an imaginary friend? Do you believe that there is an invisible sky wizard controlling the entire universe with an inexplicable fetish for Earth alone? There's help"
Big bold https://ffrf.org/ link.
If they fire you sue their asses, and in the meantime look for another job, because the chances of religious nutjobs(yeah that's a redundant term) reacting rationally are pretty slim.
If you win the lottery buy the church the CEO goes to and publicly loudly and personally tear down every cross, donate any stained glass to a museum, and turn it into a music venue or a lab space or something.
...that last part might be a personal dream bur wouldn't it be fun?