Prometheus
Semper Perconctor
As far as salvation is concerned there is no preference given to any race/lineage/etc. Just because God selects certain people to take on certain responsibilites doesn't mean he prefers them or deems them a superior race.
He must esteem something about the race to be superior otherwise it would be a random throw of the dice. The problem is that God can't make random decisions as it contradicts His omniscient nature. God must make a judgment in order to select which people will have this responsibility. That judgment would be based on some quality of the race that is superior to all the others. Either there is a legitimate reasoning behind this selection process or there is not. If there is, then His racism would be justifiable. However, nothing that we know about genetics suggests that it is justifiable.