I wonder if its a matter of communication. I mean to say that perhaps it is possible for a person to notice Dependent Arising and be transformed by it but still have little to no capacity to communicate what has occurred. I can imagine that such a person might go on upholding the traditional tenets of a mundane religion simply because that is the only framework that occurs to them for the minimizing of harm.
"Beautifully taught is the Lord's Dhamma, immediately apparent, timeless, of the nature of a personal invitation, progressive, to be attained by the wise, each for himself." Anguttara Nikaya V.332