‘Billions of years’ ???

‘Millions of years’ – who says?
‘Billions of years’ – who knows?
There aren’t any ways to test
these ages, but why have they guessed
that there haven’t been changes in the rate
of reactions they use to fix the date?
The rocks show us creatures suddenly smothered
in silt, and engulfed in mud, and covered.
And aeons of time
won’t create design:
no statistical gamble
with molecular jumble
produces a programme,
the genes of a human.