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The second marriage record on Ancestry would be the civil marriage record. Clane parish is within the Naas registration district. The first record would be the church record. Non-Catholic marriages were civilly registered starting in 1845 and Catholic marriages started in 1864.
I looked up the civil marriage record and for some reason, it does not show the names of the fathers of the bride and groom.
I also checked Roots Ireland and could not find the baptismal record for the 1848 George Robinson.
Dublin city church records are on www.irishgenealogy.ie