I think all are chosen by God.

As far as people feeling Superior to others, this seems to
be a common trait that happens all the time and probably
stems out of survival and the survival of the fittest, animal nature in us.
Many cults have probably started this way.

I deal with these tendencies all the time concerning bloodline and culture
and traditions. You see this in droves with ruling classes also to keep power.

Also to be on topic, I don't live nowhere near Sumeria or Atlantis, so I have no real opinion on them.
I truly only concern myself with Spirits that are sent from the Creator for my correction and learning
for walking my path.