Have you found Brian Lawson's site of BMD ?
It has registered births from 1821-1900 but
registration was only compulsory from 1878. You
are it seems going to have to rely on baptisms ??

Can you give us some of these census details as
everyone will not have access? Where do think
the " Captain of the Parish" fits in ? Have you
searched for CP in Manx Notebook ? [ top of this screen]