>>520514293
You can't directly. Most didn't keep records of their beliefs, culture, practices, values etc. Any records are made by romans or Christians and are generally disparaging. Ontop of this our understanding of pagan culture has been skewed by fantasists and LARPers for hundreds of years.

You can't just choose to believe in things that you happen to like the idea of

>>715235924
>I dont know much about bretons
me neither. but if we looked into it we would probably see undeniable similarities with the irl bretons