I have so far distinguished between belief as anticipation-controller, belief in belief, professing and cheering.  Of these, we might call anticipation-controlling beliefs "proper beliefs" and the other forms "improper belief".  A proper belief can be wrong or irrational, e.g., someone who genuinely anticipates that prayer will cure her sick baby, but the other forms are arguably "not belief at all".

Yet another form of improper belief is belief as group-identification—as a way of belonging.  Robin Hanson uses the excellent metaphor of wearing unusual clothing, a group uniform like a priest's vestments or a Jewish skullcap, and so I will call this "belief as attire".

In terms of humanly realistic psychology, the Muslims who flew planes into the World Trade Center undoubtedly saw themselves as heroes defending truth, justice, and the Islamic Way from hideous alien monsters a la the movie Independence Day.  Only a very inexperienced nerd, the sort of nerd who has no idea how non-nerds see the world, would say this out loud in an Alabama bar.  It is not an American thing to say.  The American thing to say is that the terrorists "hate our freedom" and that flying a plane into a building is a "cowardly act".  You cannot say the phrases "heroic self-sacrifice" and "suicide bomber" in the same sentence, even for the sake of accurately describing how the Enemy sees the world.   The very concept of the courage and altruism of a suicide bomber is Enemy attire—you can tell, because the Enemy talks about it.  The cowardice and sociopathy of a suicide bomber is American attire.  There are no quote marks you can use to talk about how the Enemy sees the world; it would be like dressing up as a Nazi for Halloween.