That's what they keep saying. And when the Pope suggested otherwise, by quoting a long-dead Byzantine emperor (who was being held captive by Muslim armies when he wrote), modern-day Muslims got pretty ticked off.
How ticked off are they? Well, they killed a nun in Somalia, they bombed a church in Nablus, they burned the Pope in effigy all over the world. That was for starters.
And more recently, according to CNN, an al Qaeda franchise vowed a war against the "worshippers of the cross":
"We tell the worshipper of the cross (the Pope) that you and the West will be defeated, as is the case in Iraq, Afghanistan, Chechnya," said an Internet statement by the Mujahideen Shura Council, an umbrella group led by Iraq's branch of al Qaeda, according to the Reuters news agency.
"We shall break the cross and spill the wine. ... God will (help) Muslims to conquer Rome. ... God enable us to slit their throats, and make their money and descendants the bounty of the mujahideen," said the statement."
But we figure they must not be serious. After all, jihad is spiritual combat, not real war. And Islam is a religion of peace.