I caused a minor dust-up on the ADF Dedicants' list recently when I objected to someone's reference to "using" gods as the gatekeepers in a ritual. Teo Bishop raised my consciousness on this a little while ago, and I've been sensitive to it ever since.
A few others on the list agreed with me, a couple thought it was no big deal. I think it is.
In ADF, officially at least, we believe in many gods and we believe they are real entities -- not archetypes, not personifications of nature, not manifestations of the one true God, but real deities with whom we seek relationship. If we really believe that -- or even if we don't really believe it but want to work within that paradigm as if we did -- then it's incumbent upon us to show the proper deference to the gods.
In your relationships, if they're healthy, you're not trying to "use" your friends. You have relationships with them. If you need a favor, you ask your friend for the favor, you don't "use" him for it. Why should the gods get any less respect?
In hindsight, I should have created a new thread to discuss this on the list, rather than respond to the original poster, who was trying to ask an entirely different question. However, I do stand by the point I made.
Along the same lines, I've also been thinking lately about how ADF Druids choose the deities they want to honor and seek relationship with. ADF allows its adherents to consider the whole range of Indo-European cultures, while encouraging us to choose a hearth culture from among them. It's probably not uncommon for members to be attracted to gods and goddesses from different pantheons, but I've come to think that those who don't want to be limited to a single pantheon should probably use some care in branching out.
Again, if we're taking the gods seriously as real entities, it's probably not wise to assume that any two we seek to honor are necessarily happy about being brought together. The Romans and the Germanic tribes were frequently at war, for example. Is it safe to assume that Mars and Thunor want to be in the same room?