I must admit, that would be very surprising/more of a change than the soulstones part. Ethiopia has been very Christian since like...4th century AD and during the 1900s (When TOS is happening) is in the 7th straight century of the Solomonic Dynasty, who claim to be descended from...well, the name sorta says it. Which is sort of why I made the thread/was so curious. The mix of 'Country so heavily influenced by Christianity' and 'Big Soulstone Users', alongside the military leader of the faction, Prince Unathi being...a prince. So presumably he's Solomonic Dynasty/claims decent from Solomon and the Queen of Sheba.
But yeah, thanks for confirming they mostly stay away from Christian/Jewish/Islamic mentions (Something I'll admit I personally find a bit of a pity. I mean, Shinto and Hinduism are currently followed religions with millions of worshippers, so it's not really a 'dead religions only' thing).
Thanks