It's best to avoid thinking of the gods as categorically exclusive pantheons who have no common essence or demand to be worshipped in a specific way which must be back-calculated based on your sub-European ancestry, because that's not how our ancestors saw them.
Without monotheism, different religious traditions were, and are, seen much like different languages—distinct, and certainly worthy of one degree or another of individual respect, but fundamentally translatable.
Odin was viewed by Romans as equivalent to Hermes/Mercury due to his having brought writing to mankind. But he also has affinity with Zeus as Allfather, and perhaps even with Dionysus or Osiris (or a Hellenic Christ) since he recounts in Hávamál how he sacrificed himself by hanging on the world-tree.
These correspondences make it possible to understand the cosmic beings underlying these names; they don't render differing interpretations 'false' or 'idolatrous'; that's the stuff of counter-religion, i.e. Judaism, Christianity in most cases, and Islam.
Now, those of us who belong to European diaspora today—and even, to one extent or another, those on the Mother Continent—who wish to get back to a healthy religious mindset do not have the luxury (or the limitation) of having a single coherent tradition passed down to us from our ancestors which can be compared/translated in relation to other traditions. We're in a new situation.
Given that, and given the fact that a good number of us are just like you in having a mixed European ancestry, OP, we ought to be willing to learn from any traditions which strike us as particularly pious and take from them what works, particularly those non-monotheistic ones which have survived in India.
If you read Platonic and Orphic wisdom and supplement it with study of present-day Hinduism and Buddhism, you'll be in a much better position to build on what we have from the ancient Celts and Germans than if you assume your ancestors to be categorically limiting you to specific forms—forms which have not been honored with the respect they deserve for over a thousand years.
Again, religion is like language, and if we find ourselves speaking a pan-Northern or even pan-European mélange, so be it.
http://www.graaaaaagh.com/2015/03/european-religion-ritual-and.html