I did find footages of ceremonies in Japanese catholic church which is called Nanzan church.
Nanzan church is one of the most famous catholic church in nagoya district.
This is footage of 洗礼式( I don't know accurate name in English,maybe Baptism
ceremony?)
They say(or sing?) in old literary Japanese .
And from around 0:56 they repeat obviously "warera no tame ni inori tamae"(pray for us)
YouTube - カトリック南山教会・洗礼式2009年
On the other hand,they use colloquia Japanese for The Load's Prayer(not including "pray for us")
YouTube - 主の祈り