Past the towering tridents that survived the World Trade Center collapse, adjacent to a gallery with photographs of the 19 hijackers, a brief film at the soon-to-open National September 11 Memorial Museum will seek to explain to visitors the historical roots of the attacks.

The film, “The Rise of Al Qaeda,” refers to the terrorists as Islamists who viewed their mission as a jihad. The NBC News anchor Brian Williams, who narrates the film, speaks over images of terrorist training camps and Qaeda attacks spanning decades. Interspersed are explanations of the ideology of the terrorists, from video clips in foreign-accented English translations.

The documentary is not even seven minutes long, the exhibit just a small part of the museum. But it has over the last few weeks suddenly become a flash point in what has long been one of the most highly charged issues at the museum: how it should talk about Islam and Muslims.

With the museum opening on May 21, it has shown the film to several groups, including an interfaith advisory group of clergy members. Those on the panel overwhelmingly took strong exception to the film, believing some of the terminology in it casts aspersions on all Muslims, and requested changes. But the museum has declined. In March, the sole imam in the group resigned to make clear that he could not endorse its contents.