No, right now you probably have no opinion on the subject. And depending on context are perfectly willing to entertain either or neither. The world will be a much better place when people stop having opinions on things just because someone asked them to pick a team.
A reasonably mature thinker holds beliefs in terms of Bayesian estimates, and as Dennet says, one should always be willing to entertain evidence that contradicts your current Bayesian estimates. That doesn't mean you don't have beliefs.
No, right now you probably have no opinion on the subject. And depending on context are perfectly willing to entertain either or neither. The world will be a much better place when people stop having opinions on things just because someone asked them to pick a team.