These entries give some details of the offences but no indication of where John TURNER might have been baptised,

BNA Hereford Journal - Wednesday 15 August 1821

On the 19th Ult. a man of the name of Dance came to this city to see the procession in celebration of the Coronation, and at night being very much tired he sat upon piece of timber near the Church-yard, and fell asleep. When he awoke he found his quarter boots had been taken from his feet, and upon further search he discovered that his pocket, which contained about 15s. in silver, had been also cut from his small-clothes, The boots were afterwards found in the possession of man named John Turner, who has in consequence been committed to our gaol, to take his trial at our ensuing Assizes. He also stands charged with stealing a coat from the Green Dragon in this city, on the night of the 21st ult. the property of Thos. Bullen, and which he had sold to a Pawnbroker in Ludlow.

BNA Hereford Journal - Wednesday 29 August 1821

TRANSPORTATION For Life. - J. Turner, for stealing a coat from the Green Dragon, in this city, and robbing J. Dance in the public street of 15s.and his boots;

BNA Hereford Journal - Wednesday 07 November 1821

Yesterday the following convicts were removed from our County Gaol for the Hulks at Woolwich, viz. John Griffiths, Robert Blackway, John Preece, Henry Phillipps, Joshua Roberts (all condemned at our last Assizes), John Turner, Thos. Thomas EJsemore, Thos. Randall, .fames Jones, John Hawkins, Joseph Smith, and Thomas Smith. The two latter were convicted at the October Sessions.

If you are convinced of the birth date there are a couple of candidates from FamilySearch;

John Turner
England Births and Christenings
Name John Turner
Gender Male
Christening Date 16 Aug 1795
Christening Place BISHOPSTONE,HEREFORD,ENGLAND
Father's Name William Turner
Mother's Name Elizabeth

Name John Turner
Gender Male
Christening Date 21 Jun 1795
Christening Place LEDBURY,HEREFORD,ENGLAND
Father's Name Thomas Turner
Mother's Name Ann