"A grave disappointment all round"

In reading the humorous “Last Page” feature of the January 2007 issue of Smithsonian magazine - one of my favorite regular magazines - about true-life personals in the London Review of Books, I was delighted to notice a clue (in the third item from the end, box 6453) to James Fenton’s poem “God: A Poem” whose second verse reads:

A serious mistake in a nightie,
A grave disappointment all round.
Is all that you’ll get from th’Almighty
Is all that you’ll get underground.

I taught this poem in an Introduction to Poetry class at Oregon State University last winter. It’s reprinted in the Norton Anthology of Poetry, 5^th edition, p. 1965. That was fun to find.