She's probably a closet Atheist like you, and only shows up on the days she really has to... like you. But she married in rather than was raised with it, so she actually doesn't know all the lines.
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<3 I don't think that reverance or respect for the dead needs the dead to be hidden from sight completely. It is the attitude that you bring, as a witness to a dead body, that matters, not the display and witnessing of a dead body, per se.