Being neither His Holiness, Pope Benedict XVI nor the Reverend Rick Warren, I don't know if I'm qualified to speak for Christianity as a whole. But as a Christian who has spent no small amount of time reading the words of Jesus, I believe I can speak to my own views.

I don't see anything inherently unChristian about competition, in sports or in business. There is a difference however between being competitive and being exploitive. If you view business and sports as inherently exploitive, I suppose I understand your view, but what a limited view of human interaction you appear to have.

Mercy and compassion are not weaknesses, so long as they are moderated by logic and justice.