The parish register entry of the marriage unfortunately doesn't show father's names!

27th October 1811, at St Mary, Islington
John Robinson to Sarah Hackie/Hackice both of this parish.
You won't find any birth certificates, because they only came into being at the start of Civil Registration on 1st July 1837

And to find the parish register entries of christenings, you need to know which parish?!

There are some possibilities for John's christening?
8th Nov 1789 at Great Budworth, Cheshire
2nd Feb 1789 at Brighton, Sussex
24th June 1789 at Chertsey, Surrey
28th June 1789 at Finningley, Nottinghamshire
29th December 1789 at Owston, Yorkshire
12th Sep 1789 at Hull, Yorkshire
4th Oct 1789 at Temple Sowerby, Westmorland
16 Dec 1789 at Tuxford, Nottinghamshire
2 Aug 1789 at Westminster, London (John Robert Adolphus)
And more in 1788, 1790 etc!