Sports aren't Christian.

"Nearly all the sports practised nowadays are competitive. You play to win, and the game has little meaning unless you do your utmost to win. On the village green, where you pick up sides and no feeling of local patriotism is involved, it is possible to play simply for the fun and exercise: but as soon as the question of prestige arises, as soon as you feel that you and some larger unit will be disgraced if you lose, the most savage combative instincts are aroused. Anyone who has played even in a school football match knows this. At the international level sport is frankly mimic warfare. But the significant thing is not the behaviour of the players but the attitude of the spectators: and, behind the spectators, of the nations who work themselves into furies over these absurd contests, and seriously believe at any rate for short periods that running, jumping and kicking a ball are tests of national virtue." -George Orwell

There's another quote I couldn't find, and it might not be by Orwell, but it goes something like this: "There's nothing Christian about staged sporting events. The concept is purely pagan."