OK, Susan, here's the thing:
After I logged off I went for my morning walk and had the darn tune in my head the whole way! Just didn't sound like the Saddlemen version,though (theirs had been salvaged from a poor quality demo tape). When I got back I checked and found a better version on a Vipers CD (the Vipers were a 1950s skifle grtoup in the UK, Lonnie's main rivals at the time). Both versions used generic "gospel" verses.
Vipers' version (significant lines only) :
Verse 1:
One of these mornings around 12 o'clock
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This old world's gonna reel and rock

Verse 2:
See those children dressed in white
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They must be the children of the Israelites

Verse 3:
See those children dressed in black
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They must be the hypocrites a-turnin' back

Verse 4:
See those children dressed in red
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They must be the children that Moses led.

Saddlemen version has verses one and two as above (though harder to decipher!)and a different third (and final) verse:

Listen you sinners to what I say
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The Lord is a-comin' on Judgement Day.

PS
Just read in a novel based in Texas that "Methodists are Dancin' Baptists and Baptists are Methodists that can't read". Is that a generally held opinion in the US?!!
RtS
(Raised Methodist, lapsed Quaker, devout Skiffler, married to a pillar of the Church of England)