The RC baptismal records for Kilmore parish start in 1859 so if Owen was from Kilmore, a baptismal record would not be available. Marriage records start in 1827. I'm not clear from your message when Owen left for NYC. Did he marry in NYC? You list Eugene as born in 1860 in Bellananagh but I was not able to locate a record.
Can you clarify where the marriage and baptismal events occurred Ireland or NYC? Thanks!