Griffiths just lists the head of household, so no information on whether he lived there with anyone else. Also I can’t say that it’s your ancestor, merely that he’s the only Arthur Campbell in that parish in Griffiths at that time.
Rootsireland seems to have James' baptism under Loughgall RC. There don’t appear to be any other children baptised to that couple in that parish. Arthur’s marriage appears to be listed, to a Creally, in 1849. Not sure about the first name though. You would need to investigate.