If you don't know the 'baby shark' song then type it into your favourite search engine and watch a video.

I have felt for a while it is ripe for a cheesy Christian makeover, and with nativity play season upon us, here is my offering, with permitted variants!!...

Gabriel, doo, doo, doo, doo

Gabriel, doo, doo, doo, doo

Gabriel

Mary, 'yes', doo, doo, doo, doo...

Joseph, 'oh!' doo, doo, doo, doo...

Bethlehem, doo, doo, doo, doo...

Baby born, doo, doo, doo, doo...

Angels sing, doo, doo, doo, doo...

Shepherds come, doo, doo, doo, doo...

It's a star, doo, doo, doo, doo...

Magi's gifts doo, doo, doo, doo... (Or: Wise men's gifts, doo, doo, doo, doo...   or: Kings bring gifts, doo, doo, doo, doo...)

Christ is born! doo, doo, doo, doo... (Or: Christmas Day, doo, doo, doo, doo...)

And now you have have the perfect annoying earworm for the day ahead!!

Edit - shared this elsewhere and people are wanting to use it for Toddler Gruops and Messy Church! Someone asked me what the actions were, so here is what I made up as I typed...

Gabriel - flap wings maybe (even if angels strictly don't have wings)
Mary - if it must be hands, then maybe thumbs up, but nodding would seem better
Joseph - hand to mouth in astonishment
Bethlehem - walking/riding a donkey/make a house/stable shape
Baby - rocking baby style arms
Angels sing - jazz hands maybe, or more wings, or hands as an open hymnbook
Shepherds - run
Star - twinkle twinkle style
Magi - present gifts
Christ is born - more jazz hands or just clap

Feel free to share/use.  I'd be grateful if you credited me and didn't pass it off as your own.