I like Chesterton. He wrote my tagline!
Are you still fighting these heathens, Marcus Tullius? Don't they understand that Religion is serious while science is just a frivolous hobby
F
Permit me to quote from Quanto Conficiamur Moerore (August 10, 1863), an Encyclical to the Italian Episcopate by Pope Pius IX:
". . . they who labor in invincible ignorance of our most holy religion and who . . . live an honest and upright life, can, by the operating power of divine light and grace, attain eternal life, since God . . . will by no means suffer anyone to be punished with eternal torment who has not the guilt of deliberate sin."
Fr. Feeney's followers have been arguing about the exact meaning and extent of this and several similar passages for years. However you take it, it seems clear that, just because your opponent appears to be invincibly ignorant is not a sufficient reason not to continue trying to persuade him of the truth. Truth of religion, but also truth of science.