Not sure that not knowing matters all that much. I'm not a DA loreist (not a word hugh, red wiggly line? Lore-ist), but hasn't a lot of Elven history been lost over the years? Maybe I'm wrong but perhaps the Inquisitor character and Elves in general simply don't know which tattoo represents which god (or maybe not for all of them).
No, the Dalish would know what Creators the tattoos represent since they came up with the designs themselves. All the evidence shows that these symbols were first used after the Fall of the Dales, when the Dalish first splintered off into nomadic tribes... whether Bioware tells us what they mean or not (they said that they will), the Inquisitor would know since s/he's a Dalish elf and grew up immersed in that culture. Knowledge of the Creators is one of the few things that they managed to hold on to even throughout the long centuries when the elves were enslaved. It is the cornerstone of their existence and one of the main reasons they refused to integrate into human society centuries ago.
Of course, that's just how the Dalish view their culture and religion... as with most things, YMMV.