I swear to Darwin on a Stack of Gods
the way an athiest or non-believer can express with utmost certainty that they are telling some-one the truth (as far as they know it to be).
"I swear to Darwin on a stack of Gods, Kirk Cameron is a Dumb Dick !!!"
"I didn't drink the last beers in the fridge.....I swear to Darwin on a Stack of Gods."
"I didn't drink the last beers in the fridge.....I swear to Darwin on a Stack of Gods."