Well, you could do it the biological classification way, wherein arms, wings on a bird, and fins on a fish all evolved from the same structure in common ancestors, whereas legs and wings on a bug evolved from a different ancestor, i.e. when the split occured, there was no "armish" type thing on that common ancestor, yet.
In that sense, the God of Judaism, Christianity, and Islam are all the same God, whereas of Hinduism, it would not be.
Although records are incomplete, you could in theory trace Yaweh back into an even earlier religion where he was just a member of a pantheon (I'm sure the loss of the Great Library at Alexandria had something to do with this.

). And you could continue to trace as various gods and goddesses mutated, were removed (typically via conversion into a (super)human like Samson, or an angel, i.e. a created, if still supernatural, but no longer divine, being.)
You could then see the relationship to Odin, Zeus, etc. Actually, unlike biology, the situation would be even murkier as two completely separate religions might "interbreed", so to speak. In fact, this is well known to be the case as the gods in one religion would be the demons in the next door neighbor's culture.