I know his date of birth, date of death and all the census details for every census except 1841, plus I can't find his birth details in the on-line registry. Were Catholic births not registered centrally?
From my limited experience, they often seem not to have been.
In my OH's tree, her GG-GrandParents came over from Ireland and married here. In subsequent generations, marriages are in the GRO indexes, as are deaths (I'm guessing because these were harder to avoid), but no births were registered. This was the case from c.1850 when they came over right up to 1915 when the last unregistered birth occured.
(We're visiting the relevent church in two weeks time to try to get the details. They agreed in the end, but were very reluctant, citing Data Protection Act!!!!)