Time for the almighty to intervene.
The phrase "God bless you" is attributed to Pope Gregory the Great, he said it in the sixth century during the bubonic plague epidemic as sneezing was an obvious symptom of one carrying the form of the plague. So "God bless you" was a bit like "God save you." It's not an expression of good wishes upon parting circumstances, and it's nothing more than a colloquial statement coined by some random pope a long time ago. If we're working by that premise, you should only say God bless you in a situation of sneezing.
Going even farther than that, beyond the concept of "God" referring to the Judeo-Christian God, a term relatively akin to "God bless you" was said during sneezes because it was theorized that your soul could escape your body when you sneeze.
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