Nam, when my mom still believed, I got dragged to church every sunday, not exactly kicking and screaming, but certainly skulking and grumbling.
Had to do something to keep my mind busy. There were evangelical children's books there.
But I burned through them in a few weeks, so I turned to ... Roman numerals. Had this little notebook where I'd write numerals. XL, XLI, XLII, XLIII, XLIV, XLV, ...
Gave up when I got to the point where I got tired of writing strings of M's ... luckily, this more or less coincided with my mom ditching her faith.
Anyway, I suppose everyone here knows Numberphile on the youtubes ... what?! You don't?!
Here's a video of theirs that speaks to existance of numbers ...