He's already playing the game. His values may be very different to our own but he's playing.

Ok, agreed.

kid tells you they're a god

I assume you mean there is a god?

Treating him lightly would be dancing off to believe in some random god because I got the warm fuzzies when I went to a church/mosque/whatever, or because of what I read in some book.

Also agreed.

he's being asked to do it as a parlour trick

This is what I was assuming you were asking to have happen.

I am working on a longer response now that I have a better understanding of what it is you are requesting.