Marilyn, I had a look on Roots Ireland at the baptisms or some of them anyway and could not find a Patrick born to those parents in Ireland but a random thing I noticed was a witness to one baptism was a Sherlock lady and in 1799 in Darver, Louth about 15 miles from Navan there is a Patrick born to a Peter Lawless and an Ann Sherlock with a witness Mary Sherlock, wonder if he remarried. Howver the only marriage I found was not to a Sherlock post 1790.
Roots Ireland is good for baptisms etc in the church records however there are gaps and the only other suggeestion I can give you is to have your own read of the registers here but not a task I envy you, the registers are here but only searchable by month and year. I now see that it only goes to 1813 and then a large gap. You can look at Roots Ireland to see if they have it or it may be totally lost, https://registers.nli.ie/parishes/0955
Sorry the news is not better,