http://www.bbc.co.uk/sport/gymnastics/37832754
I struggle to see what his views on a religion have to do with his ability as a gymnast.

They may feel it's inappropriate to mock others beliefs but banning him seems OTT.
Surely getting death threats is more than enough for him to deal with. For laughing.
There is no actual supporting evidence for any belief and yet someone has their livelihood threatened for laughing at it in a private situation. Seems very unfair.