Well I've done a little digging of the comparison of the Egyptian pantheon from Egypt, & how it correlates to Elven Gods of Arlathan. And Egypt is widely know to be one of the most advanced civilizations of the Ancient world, just like Arlathan is the most advanced civilizations of all Thedas.
Not true. The qunari are technologically the most advanced civilization in thedas.
Technically the Greeks learned math, architecture from Egypt and plagiarized the Egyptian Gods.
Romans learnt those from Greeks and Egypts and became more advanced.
Also, why do you think the greek gods were a plagiarized version of the egyptian gods? There's a lot of differences between the two pantheons.