Again, and with all due respect to Theodore M. Utchen, we will pray where we want when we want. Who's we, you might ask? The American people.
Any kind of "showboating" or drawing attention to yourself while taking away from the team was strongly discouraged where and when I was raised.
That being said, these Christian athletes, I would guess, are simply thanking God for helping them to get in the position to have success. Thanking him for simply being God. That's really all God wants, is for us to humble ourselves before him.
To me, it sounds like your real problem is the First Amendment.