Hi George,
Are these living in Lancashire? Lancs OPC has 4 baptisms for John Prescott's:
http://www.lan-opc.org.uk/Search/indexp.htmlBaptism: 30 Aug 1789 St Peter and St Paul, Ormskirk, Lancashire, England
John Prescott - Son of Edmund Prescott & Dorothy
Notes: Christened at Skelmersdale Chapel Poor
Register: Baptisms 1771 - 1794, Page 94, Entry 9
Source: LDS Film 1849663
Baptism: 6 Sep 1789 St Elphin, Warrington, Lancashire, England
John Prescot - Son of Thomas Prescot & Jane
Occupation: Weaver
Register: Baptisms 1781 - 1812, Page 97, Entry 3015
Source: LDS Film 1562957
Baptism: 13 Sep 1789 St Mary the Virgin, Leigh, Lancashire, England
John Prescot - Son of Ralph Prescot & Martha
Abode: Bedford
Register: Baptisms 1782 - 1797, Page 82
Source: LDS Film 1885648
Baptism: 4 Oct 1789 St Michael, Aughton, Lancashire, England
John Prescott - Son of William Prescott & Margaret
Born: 14 Sep 1789
Abode: Aughton
Register: Baptisms 1761 - 1812, Page 24 & 25, Entry 3
Source: LDS Film 1657556
Good luck with your search.
Kit