Answer:
Mandarin
Explanation:
Mandarin Chinese (1.1 billion speakers) ...
English (983 million speakers) ...
Hindustani (544 million speakers) ...
Spanish (527 million speakers) ...ect.
it is generally assumed it was a singularity in time and space, which started to exist when and after the big bang. if you want, i can add some articles you may want to read!
From what i understand, the church liked the consistency of it, since it had been used in the liturgies and all for such a long time. hope that helps?