(According to the Wiki, it can stack with Unyielding, unlike Unrelenting)
You missed the bit on the wiki that's rather clear: 'Pagan religions retain some features when reformed, regardless of the features chosen during reformation. However, a religion can only have one "unit modifier", so offensive pagans will lose levy size and other bonuses if they select a reformation feature that adds a competing "unit modifier".'
Unyielding provides a modifier and Eternal Rider provides a modifier, so one of them *will* be lost when the religion is formed.
Here's a pagan religion idea to make up for it.
Awesome Heirs:
Base: Doesn't Matter, although Hellenics and Zunists get an extra reformation belief, and it works pretty well for Bön.
Nature: Doesn't Matter
Doctrines: Astrology, Meritocracy. Hellenics get Astrology for free, and can pick Civilized instead of Meritocracy,
but Stability+Civilized does
not grant Meliorism synergy, sadly. Zunists get the useful part of Astrology for free (who needs an astrology sign?), so they get one free pick here. Bön can pick Harmonious instead of Meritocracy.
Leadership: Slightly Matters (Careful about Temporal if Bön and Harmonious, since the religious head title is stuck to Agnatic succession. Also, Autonomous is actually useful here for Hellenics and Bön)
Why?: Astrology allows use of the Hermetics for good educations for your heirs via Make Horoscope. You can then choose the best heir from a crop of good education heirs with Meritocracy.
Bön do this fantastically, since their female leaders can have up to 3 male consorts and Harmonious Doctrine gives both Stability and Equality, although it reduces the usefulness of Temporal Nature (since the Head of Church is locked at Agnatic). Luckily, Autonomous Leadership provides them +2 Learning (great for Hermetics!), although it disallows Great Holy Wars. Bön also get access to gurus, who are excellent doctors and apprentices, and the feature of priests being unable to inherit. One could even be tempted into going Peaceful Nature with Autonomous Leadership (since you can't GHW with either choice and Tibeto-Burman culture allows raiding), so you can hold extra temples (Monastic Feudalism is lovely for Tibeto-Burman Böns) to give out to your sons. This is ultimately a poor decision, since the
really bad part of Peaceful Nature is being unable to take the Hunting Focus. Proselytizing Nature is actually more important for Bön since Old Bön provinces are harder to convert (my memory says Buddhist provinces are also hard to convert, but the wiki doesn't mention it anywhere, so my memory might be wrong).
What are good picks for the "free" doctrine for Hellenics? Stability should only be picked with Meritocracy, not Civilized. Equality gives a slightly worse version of Bön, since Hellenics don't allow concubines. Monasticism is an interesting choice, since you can now order most of your unworthy children to take the vows (although you can revoke temples and grant them to your children, which disinherits them). You can also ascend to Godhood with Divine Marriage, Temporal Leadership and Dogmatic Nature. Hellenics also get +2 Learning from Autonomous Leadership, so it's not a bad choice for them. Sea-Bound gives you cheap ships to raid with (yes, Reformed Hellenics are allowed to raid, despite Unreformed Hellenics being unable to raid). Bloodthirsty Gods lets you sacrifice courtiers to read their entrails, and a non-Peaceful nature also gives you access to the Flower Wars CB.
What about Zunists? Autonomous Leadership is worse for Zunists, so it shouldn't be picked. Zunists can ascend to Godhood with Dawnbreakers (also gives Polygamy, which allows you to marry 4 of your sisters, who should have excellent educations), Temporal Leadership, and Dogmatic Nature. Stability gives you better Meliorism, which shouldn't be overlooked. You can also raid as Reformed Zun (can't as unreformed Zun), but unless you manage to control a significant coastline (your Holy Sites are mostly inland and really widespread), Sea-Bound won't be that useful for you. Bloodthirsty Gods with a non-Peaceful nature gives you access to the Flower Wars CB.
Other choices are possible for the free doctrine for Hellenics and Zunists, but I've said quite a bit as is.
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