Two groups suffered similar fates under the Roman Empire: the Jews and the Celts. Both were conquered, repatedly rebelled, and had their societies utterly destroyed by Roman forces. But the core religious and cultural elements of Jewish society in antiquity - what became modern Judaism - survived. The Celtic / Druidic way of life didn't.
As far as I can tell, the reason Judaism survived was because Judaism was a textual language. It was written down in the Torah and the rest of Tanakh. When Judean society was destroyed by the Romans, Jewish scholars wrote more of it down (the Mishna and the Talmud). Jews outside of majority-Jewish societies were able to carry their traditions with them across the world.
What if the core ideas of Druidism had been written down? This could either be in some form of early Ogham or in another script; what matters is that it's written down before Druidic society is completely erased by the Romans. Would this have changed anything? Enabled Druidic thought to persist across northern Europe?
As far as I can tell, the reason Judaism survived was because Judaism was a textual language. It was written down in the Torah and the rest of Tanakh. When Judean society was destroyed by the Romans, Jewish scholars wrote more of it down (the Mishna and the Talmud). Jews outside of majority-Jewish societies were able to carry their traditions with them across the world.
What if the core ideas of Druidism had been written down? This could either be in some form of early Ogham or in another script; what matters is that it's written down before Druidic society is completely erased by the Romans. Would this have changed anything? Enabled Druidic thought to persist across northern Europe?