Rodnok
Prince
Same game, I am Catholic, I have both religions in some cities and was wondering why I can't build some Wonders again. House of Wisdom and University of Sankore require Islam state religion apparently (were available after save and converting back to Islam) but this time I can't see any hint about that in Civilopedia. Should be probably mentioned there the same way as Krak is (if the requirement for the Islam state religion is correct). Better maybe in the text than just tooltip.
Or all wonders which require just a single religion want you to run it as a state religion?
Or all wonders which require just a single religion want you to run it as a state religion?