As noted by mystikx21, selecting the religious belief Feed the World would appear to give +3
x2 = +6
in total.
GEM 1.13.4/[CivUP 2.5.2]


- Screenshot 1: note the Shrine tooltip does not reflect the effects of chosen religious beliefs; (I have chosen via IGE Feed the World and Ancestor Worship).
- Screenshot 2: food breakdown is highlighted and shows that terrain is giving 4
(which is correct), but that religion and buildings are each giving 3
. The only 'food building' in the city, however, is the religiously enhanced Shrine, so Feed the World's effect is doubled for some reason.
- Screenshot 3: included to show that Ancient Worship works as it should, i.e. a total of 4
(1
from Great Mosque of Djenne, 3
from the Shrine with Ancient Worship).
Lua log attached and since this is just an IGE example I can easily replicate another if needed. - Screenshot 2: food breakdown is highlighted and shows that terrain is giving 4


- Screenshot 3: included to show that Ancient Worship works as it should, i.e. a total of 4



GEM 1.13.4/[CivUP 2.5.2]