Given our current situation with a lack of Copper I'd suggest Archery first, then go down the line to Priesthood (for Oracle)
Archery - 8
Mysticism - 8
Meditation - 12
Priesthood - 9
So a total of 37 turns all together, ignoring growth so that time will likely reduce a bit.
Oracle is then 150 hammers to build. (Double speed with Marble, and right now there is no Marble in sight.)
Other Option
replace Meditation with Polytheism - 15
Then go for Masonry - 10
And then go for Monotheism (Judaism) - 18
More time intensive path (taking 59 turns to research), ignoring time to build Oracle, and we may not necessarily get Monotheism first still.