Bogs throughout Northern Europe received sacrifices from Celt and German alike. Weapons and armor captured in battle, food and beakers, miscellaneous items - all were deposited in lakes and marshes in the same way, to the point that we can't even tell which finds are German and which are Celtic.
When the Druids sacrificed to the Gods, the blood from an animal was sprinkled with a sprig of greenery on the assembled people, so the divine energy inherent in blood could be directly transferred to them. In historical Asatru, our forebears did exactly the same thing in the course of a sacrifice or blot.. (Today, modern practitioners of both religions use mead or other fermented fluid in this role.)
Across the length and breadth of our European homeland, our ancestors honored the Gods in the open air, because we thought it inappropriate to shut them up into limiting, lessening structures like the Christian churches. Similarly, in the earliest days, our representations of the Gods and goddesses were simple indeed - often carved from pieces of wood to which Nature had already given the basic shape, awaiting only a few refinements from human hands.
These customs accurately describe Celts as well as Germans.
Tribesmen of both groups used intoxicating drink in religious ritual. Often this was mead, but it could be ale as well. And, while we're considering altered states of consciousness, let's remember the fit or frenzy of the Odin-gripped warriors, the berserkers. In old Ireland, essentially the same warrior's madness bore the name of "{\i ferg} ".
Readers of the Norse stories will remember how Sigurd the Volsung killed the dragon Fafnir and roasted its heart. When he burned his finger, he stuck it in his mouth and found that he could understand the speech of birds. The Irish hero Fergus gained the same gift when he singed his finger while cooking a salmon over a fire.
MAP OF THE UNIVERSE...
When we look at the cosmology of the Teutons and that of the Celts, we can't help but see the likeness. Both have the giant tree, the center of the cosmos and indeed the framework in which all the worlds are found: to Asafolk, it's Yggdrasil; the Celts call it Bile .
The other key component of the universe in ancient Germania was the Well of Wyrd, containing the deeds that make up the past. Drinking from its waters gives wisdom, and Odin gave up one of his eyes for the privilege. As it turns out, the Celts have an almost identical well; hazel nuts fall into it where they are eaten by the Salmon of Wisdom.
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