Except that alignments in DnD are, well, *not* specifically linked to diety. Okay, in 4E, as I understand it, they are; in 3.x, the alignments are spelled out as largely independant of any one specific entity. Of course, 3.x alignments are much more entwined into the system than in 4E (again, as I understand it). Home-brew worlds may take liberties with this, but the core books - and thier readers - have no way of tracking such changes.
The base question is the source of moral authority. Who or what dictates ethical behavior? Is a given act Good because the Gods declare it so, or do they declare it Good because it
is so?
If morality stems from the specific diety a character worships, then we have Subjective morality. What is Good is at the whim of your god and might change tomorrow or in the next heartbeat.
If morality is from a source higher than the gods themselves, then you have Objective morality. Even the gods themselves can be judged based on moral criteria; harming others for one's own gain, Evil ... stopping one from harming others, Good.
The Paladin, as the ur-example of alignment studies,
runs on Objective morality. They just don't quite work if moral authority is at the diety level; a dedicated follower of, say, Heironeous wouldn't be able to Detect a dedicated follower of Hextor, if both followers are considered Good for acting in accordance to their respective deity's wishes.
The flip side, of course, is that Heironeous's follower
would be able to Detect Hextor's follower, 'cause Hextor himself is Evil and, as such, so must his commands be. This thought leads us to the notion that morality, in this case, is decidedly *not* subjective.
Sorry if it's a babbling essay; ethics debates are a pastime of mine. Rather interesting, really

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