My position is that unless we learn to love other Muslims DESPITE and WITH all that we might disagree with them upon, we can't be united. The Saudi approach--and that of other neo-purists--is to say "No, no, no; there is only one thing here--we are all Muslims." and then only allowing what and how they understand things to be as what that "one thing" is. Too often it is these very people who will be quickest to say--maybe because they understand Islam in a very narrowly-defined unitary whole--that this or that practice is "not Islam" and therefore Sufis, say, or Shias are not Muslims. That's what's gotta change if we are to be united; we have to recognize that there will be those who are more in tune with the metaphysical side of the bigger picture (such as the Sufis), and others that will look at things rationally (such as those who follow Kutub or Maududi), yet others who revere the personal link to The Prophet (as the Shias do) and yet respect (and not even just tolerate) them all as different interpretations within Islam.
Forcing people to believe as one never works, and only creates harder divisions.