No, God is not going to favor one team over another, but that does not mean that it is wrong to give praise for being blessed with the ability to score that touchdown or sing that song.
Thanking Jesus publicly for their gifts, as these athletes/actors/musicians do, is a way of proclaiming their beliefs. It says, "I am successful and I praise God so it must not be hokey and maybe those who consider me a role model will give praise as well."