The same god?

I was talking to a friend the other day who teaches young children, and she told me that one of her pupils had said that there were lots of gods. My friend corrected her, saying that we all worship the same god, but in different ways. As an atheist, I can see a sense in which this is true from my point of view, since all nothings are the same. On the other hand, if there is a god, does it make sense to say that Ganesh is the same as Allah? Perhaps this is a case of "Hesperus is Phosphorus", the sentence used to illustrate the distinction between 'sense' and 'reference' due to Frege.