That is true. I mean, I'm not exactly used to a world where there are deities walking among us and supposedly fictional concepts are actually reality. Would stand to reason that someone confused enough might mistake one for the other.
Given the number of summaries I saw even on just a brief glance where characters suddenly gain a sibling or child or unknown love interest? I think you have a point with the readers having difficulty distinguishing. Even some of the writers, I'd hazard.