There are certain words that should be avoided by atheists, rationalists and free thinkers in their writings and conversations. They can, however, be frequently found in the writings of theists, the irrational and those who prefer not to think. (Yes, the headline was meant to be ironic and sarcastic.)
This isn’t meant to be an exhaustive list. I’m simply suggesting the most common words I encounter in religious and philosophical discussions. They reflect a certainty about reality that thinking people don’t accept. I’ll present them without comment, but please feel free to provide your own.