Hi Tracey,
You can search church records at irishgeneology.ie, they have a decent amount for the meath street area. You should check under st catherines and st james. I had family living round there and thought their records would be under st catherines but most weren't.
As regards the prison records, in my experience there isn't much info to be had from the LDS records but if you take down information such as dates and addresses you can see the actual prison records on FindMyPast. If you don't have a subscription you can buy 100 pay as you go credits. Each prison register is 20 credits but I found a lot of information on the records such as addresses, physical description, next of kin, occupation, offences, sentence etc. The records of 1910 in Kilmainham were a little sparce for me but 1913 and 1914 were very detailed.
Best of luck,
Amy.