It’s customary for Christians to keep visible prayer in private forums, which to argue super pickily, a football game is (you have to get a ticket and go there, or else tune in coverage on TV). The biblical concern is, of course, who is getting the glory — is it you for praying or is it God for being prayed to? The Lord is not interested in the former.
Several references to praise, which I do not know chapter and verse offhand, say make a joyful noise unto the Lord; and that praise is a sweet savor to the Lord, that we should witness to others. Also many, many admonitions to give praise unto the Lord.
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