i think this has got to be the right family, although John and Sarah are shown as born in County Durham.
HO 107 / 314 / 6 / 9 / 13
Belmont, Pittington, Co. Durham
John Atkinson, 40, Carp[en]t[er], Y
Sarah do, 30, Y
George do, 10, Y
Mary do, 8, Y
John do, 5, Y
I can't see a marriage, but is this her baptism? If so, the marriage may have taken place in the same church.
Description NORTHUMBERLAND: Etall Meeting House (Presbyterian): Births & Baptisms
It wouldn't have been legal to marry in a Presbyterian church in England until 1837.
Quite a few Presbyterians from this part of Northumberland nipped over into Scotland to get married
Or they had an 'irregular' marriage at Coldstream or Lamberton
http://www.rootschat.com/links/01gpp/ Coldstream is reasonably close to Etal.