 FACT: When Father MacLeod is saying the funeral Mass for the slain  child, the Latin he uses is completely random. For example, during  the ablutions (where he is washing his fingers presumably prior to  the consecration) he is saying the "Hail Mary", which is not part of  the Mass liturgy at all. Also, if the action is contemporary (as the  cars being used suggest), the Mass would almost certainly be in the  vernacular (i.e. either English or Spanish).