A Christian baby (named after a genre of quora questions) is a hypothetical where the scenario described is made such that the only good outcome is predetermined by the asker (i.e. converting to christianity)
P1: if hitler was trapped in a building with one thousand orphans and the only way to save the orphans was to save hitler would you save him?
P2: that is such a christian baby
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.