ad. 1. We already have neoplatonism.

I may as well ask it here too:

Do you ever plan on adding the semi-new Tibetan, Nepali, and Western Chinese provinces? And if so, do you also plan on adding the future Central African provinces that Paradox intends on adding?

2. Source?
3. Himyar was a religiously diverse area at start.
4. https://ck2.paradoxwikis.com/When_The_World_Stopped_Making_Sense#Is_Tibet_being_a_wasteland_intended.3F Same applies for any other map change.

Okay cool, understood.

I would like to suggest 7 things. Mainly for historical accuracy.

1. Remove the South Arabian culture group, as it is a language rather than a culture. The language would be spoken by the Qhatanite Arabs which are already a culture.

2. Remove the Yathribi culture group. They were just Adnanite Arabs.

3. Remove Arab names like "Abdul-Azeem" from the Libyan culture and other non-arab cultures.

4. Remove the name "Tariq" from North African cultures.

5. Rename the Kingdom of Maghreb to Kingdom of Tamzagha.

6. Replace muslim flags in North Africa with non muslim flags.

7. Look into Vandal names being so High German?

Set Nicene religion as no-reformed pagan one, leting us to reform christianity and stablish the new religion. Great Schism could happend like now with some events during reformation, making apear two religions.

What do you think??

Nicene is definitely Christian, makes no sense to put it into pagan group.
Having access to the new reformation mechanic would be great, though.

Yes, as IHateTrains said that makes no sense historically and wouldn't be accurate at all.