Have they changed? Yes, they have changed in a lot of ways Romans has trade them with things and took things in return like clothing , housing , food and much more.
Religion was another bond of Celtic society. Each tribe had its own deities and cults. There were hundreds of gods and much more, but their roles and rites had much in common.
They traded grain from 160 storage pits. The Celts traded iron and copper. They tanned hides, milled flour, produced colored glass pottery, and mined gold and salt.