'researcher tells me they are not listed in Bristol church records'

I also used a researcher looking at Bristol records of family from St George - who told me people came from surrounding areas to work and marry in Bristol.

Was your William Charles ROBBINS' marriage to Johanna Elizabeth MACK at St Pauls, Bristol in 1825 - (Henry & Hannah ROBBINS witnesses) - the only ROBBINS and MACK marriage for (give or take say 5 years?) and did any of the above couples, witness any other marriages at St Paul's Bristol? (trying to form family groups).

Professions can go through generation after generation - including Masons.....

for example....

1861 Census, Bristol & St Jacob

there is a family of ROBBINS who the head is also a Stonemason.

Jno ROBBINS - age 31 - Mason, born Gloucester St George (a parish of Bristol)
with wife Eliza age 30 - born at Glos. Bitton - and 3 children, Eliza John and Aaron.

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One would also assume with the names of the two children of William & Johanna - William Charles and John Curran Philpot ROBBINS - these carry family christian names and surnames in the case of John.

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Bristol & Avon Family History Society

http://www.bafhs.org.uk/

There at least 6 ROBINS members who are researching this surname on the above website.