Higbey already posted a reply to this.
At Christmas Graal isn't celebrating Christ's birth. We're just celebrating Christmas. No Christian meaning behind it, that's why nothing Christian is sold there.
It's pretty much the same for Easter. We don't celebrate that Christ has risen from the death. We celebrate Easter with Easter eggs and Easter bunnies, not religious stuff.
And for Halloween, it has nothing to do with the Christian occasion, that takes place on the same day I believe.

Oh, you're also complaining about the church?
They put the church in Graal, because I guess at least in the countries most of the players come from (except the countries in which the main population is Muslims ), most people marry in a church .