Ed.. there is not-- to me-- a huge difference between a "personal opinion" and a "belief" until one specifies that that they consider it to be different...or act on it in some way. You gotta ask people to define & clarify what they mean before you can debate them properly.

if I personally 'believe' that homosexuality is evil and forbidden by some religious doctrine, then even talking... much less trying to control it... about it causes uproar & concern.

If I 'believe' that dancing is immoral and forbid my children to participate in dancing in school, this creates tension and embarrassment for everyone.

If I 'believe' that (Christian) prayer ought to precede public events like sporting events, no matter who is attending and how everyone else feels, it will cause conflict. (and I have experienced this at meetings of a woodworkers club!)

....but if I 'believe'(or say that I do- with a straight face) that my moderately successful team is 'really' better than others, it only affects those who take such silliness seriously. Of course, if the belief IS serious, and involves accusations of cheating...etc., it can become serious.

similarly, if I 'sorta' believe that black cats & walking under a ladder are bad luck.... and other cultural superstitions and 'old wives tales', it usually makes little difference. It may make others tease you or make remarks, but is not usually a major area of conflict for society.... although at one time, some beliefs WERE important.