Problem is that you need to know the exact parish where your ancestors lived...and the pages are not always easy to read.
I have an Irish ancestor whose date of birth I know, but I don't know where she was born and her surname is a very common one, so I have not managed to locate her yet. Maybe if I spend enough time on it I will find her.
https://churchrecords.irishgenealogy.ie/churchrecords/
Thanks, I have used the above site, but even though I know from US records that my ggGrandfather was born in 1829, I have no clue of the month and day. That makes finding him impossible.
If she came to America and you know timeframe...have you tried the ships logs?