Familysearch.org have films of the original registers, but they are only viewable at an LDS library.
They also have the Bishop's Transcripts, which are viewable from home if you're signed in.
Go to 'Catalog' at the top of the page. Fill in Bow as place. 'Church Records'.
Film no 005750638. Image 204/230. (Film, or original register, not easy to see.)
William Earland, bachelor and Catherine Kellaway spinster, both of 'this parish'. Married by Banns.
Both make their mark. Witnesses John Martin, and Thomas Madge.
A link on familysearch Family Tree 'records' page has William Earland born 12 JAn 1809 at Winkleigh. Father Mark, mother Ann.
But I see there's another William Earland baptised 9 July 1809 in Crediton, father Thomas, mother Grace.
About the same distance away from Bow.
Crediton is the much bigger place, and easier to get to from Bow along the main road. Winkleigh is up into the wilds of Devon from Bow!
Do you know which one of these he might be?