NEW YORK - They will read the names, of course, the names of every victim who died in the Sept. 11 attacks. The bells will ring. And then that moment of unity will give way to division as activists hoist signs and march, some for and some against a planned mosque two blocks from ground zero.

This 9/11 is more political and contentious than the eight before it, with grieving family members on opposite sides of the mosque battle.

The debate became so heated that President Barack Obama felt the need to remind Americans: "We are not at war against Islam."

It was uncertain Friday whether hushed tones would replace the harsh rhetoric that threatened to overshadow the commemoration of the terrorist attacks that killed nearly 3,000 people in New York, Washington and Shanksville, Pa.

The son of an anti-Muslim pastor in Florida confirmed that his father would not - at least for now - burn copies of the Quran, a plan that inflamed much of the Muslim world and drew a stern rebuke from Obama. But Terry Jones got on a plane and landed in New York on Friday night. Jones has said he wants to meet with the imam behind the proposed mosque.

Surrounded by a throng of police, Jones declined to comment to reporters who waited for him at LaGuardia Airport and followed him to a waiting cab.

"I'm talked out," he said.

Activists in New York insisted their intentions were peaceful.

"It's a rally of remembrance for tens of thousands who lost loved ones that day," said Pamela Geller, a conservative blogger and host of the anti-mosque demonstration. "It's not a political event, it's a human rights event."

The site of the proposed mosque and Islamic center is already used for services, but it was padlocked Friday, closed until Sunday. Police guarded the block, and worshippers were redirected to a different prayer room 10 blocks away.

More than 2,000 supporters of the project, waving candles and American flags, held a vigil near the proposed Islamic center's site Friday evening instead of today, saying they wanted to avoid entangling the mosque controversy and the Sept. 11 observance.

Organizers "believe that tomorrow is a day for mourning and remembrance," said Jennifer Carnig, a spokeswoman for the New York Civil Liberties Union, one of the vigil's sponsors.

Stephanie Parker, daughter of 9/11 victim Philip L. Parker of Skillman, N.J., said she came to the vigil because she's troubled by what she sees as people wrongly equating all of Islam with the extremists who attacked the trade center, and by the way the furor surrounding the mosque has become entangled with the attacks' anniversary. She has previously spent those anniversaries with her family.

"I think the anniversary is being overshadowed," Parker, 21, a senior public relations major at Drexel University in Philadelphia, said in an interview as she relighted a candle that kept blowing out in a breeze.

U.S. Rep. Keith Ellison of Minnesota called for devoting Sept. 11 to honoring victims and the first responders who worked to save them - not the Islamic center controversy.

"It is not proper or right to distract from honoring those heroes and remembering those victims. Not doing anything else than that tomorrow," Ellison, who is Muslim, told the crowd. "And yet we know the possibility of that is real."