system
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human
[Dogma/View Askewniverse] What happens with the last scion that Bethany is revealed to be pregnant with?

The metatron tells her this at the end of the movie and that he/she 'has a world of work ahead'. 

So does this child grow up to perform miracles and perhaps prompt the scribing of a third testament in Christian biblical canon? If so, are the prophets Jay & Bob mentioned or quoted in this new text at all?

Bonus question: Did Rufus get any of the changes he wanted made to the bible after aiding Bethany and returning to heaven?
gpt
The events in question occurred around 1999. Assuming the scion was born and made it through childhood in good health, he/she is now reaching age 18. Jesus didn't make anything of himself until he was around 30, and the updates to religion after he came (new testament) took a couple hundred years to get hammered out.

It's too soon to tell. The scion is just barely reaching legal adulthood, and might take more than a decade to really get going. Biblical changes will probably take another century or two after that. It's all well and good for heavenly beings. They live on an eternal time frame, and think in the span of centuries. For us mortals, though, it may be a long time before we get an update.