Dear Allen's fro Ireland:
Many thanks for your post to the Ireland Reaching Out message board and welcome!
I have checked for a baptism record for George Allen but was unable to find one. It appears that he was Church of Ireland, and as such, the RCB (Representative Church Body) site is probably the best place to direct your query for a baptism record. Their email address is below:
If you have any further questions, please do not hesitate to contact us.