ROME (RNS) — Some anti-immigrant and conservative leaders in Europe and the U.S. say refugees arriving from Syria should be considered potential terrorists, and some suggest requests for asylum should be vetted on the basis of religion.

Their reasoning has centered on a Syrian passport found close to the unidentified body of one of the assailants in the attacks last Friday in Paris. Responsibility for the attacks was claimed by the Middle Eastern militant group known as ISIS.

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While the passport — whose details were reported to be those of a dead person — may not be genuine, the slaughter of 129 people and injuring of hundreds has intensified the debate in Europe about whether Syrian refugees pose a threat. The debate has spilled across the Atlantic.

In the U.S., several Republican presidential candidates have opposed welcoming Muslim refugees from Syria and have been cheered by conservative activists for doing so. And more than half the nation’s governors — most of them Republicans — have said they oppose letting Syrians into their states.

“If we have these people staying in Slovakia legally, it’s our duty to verify whether they have contacts with problematic persons.”

In Europe, Polish Foreign Minister Witold Waszczykowski suggested taking male refugees arriving on Europe’s shores and forming an army that would be sent back to fight ISIS.

“Tens of thousands of young men disembark from their rubber dinghies with iPad in hand and instead of asking for drink or food, they ask where they can charge their cellphones,” he said, according to the Agence France-Presse.

Related: Will Refugees Bring Terror?

Slovakian Prime Minister Robert Fico told reporters that Muslims in his country are being monitored as a potential threat.

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“With the exception of Norway’s (Anders Behring) Breivik mass shooting, virtually every time there has been a terrorist attack, representatives of the Muslims were responsible. Therefore, if we have these people staying in Slovakia legally, it’s our duty to verify whether they have contacts with problematic persons,” he said.

Religion may be a factor in an asylum application, if the individual is part of a persecuted religious minority.

While President Obama and other world leaders discussed the refugee crisis and the Paris killings at the G-20 summit in Turkey, experts on religion and humanitarianism held their own meeting at a G-20 Interfaith Summit in Istanbul.

Kat Eghdamian, a researcher at the University College London, criticized the anti-refugee statements by political leaders.

“This has a very anti-Muslim, xenophobic aspect to it,” she said. “They’ve started to polarize the debate between refugees who are ‘deserving’ and those who are ‘not deserving.’”

While the majority of more than 820,000 people who have arrived in Europe by sea so far this year come from Muslim countries, Eghdamian pointed out that those seeking refuge are fleeing the same dangers no matter their religion.

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“There is no alternative for these individuals. Many of them are fleeing religious extremism and religious terrorism; that’s true for the Muslim refugees as it’s true for the Christian refugees,” she said.

And while some politicians have argued against accepting Muslim refugees because the politicians’ countries do not have established Muslim communities, Eghdamian said it’s still discrimination and “clearly just a political move.”

Religion may be a factor in an asylum application, if the individual is part of a persecuted religious minority. But Lena Larson, executive director of the Oslo Coalition on Freedom of Religion or Belief, said religion should not be used to deny refugee status.

“If your life is in danger, it doesn’t matter which religious belonging you have,” she said.

Larson acknowledged that moving to a secular country would prove challenging for people from religious countries.

“When Muslims are coming from a Muslim-majority country to become a minority, that is also a challenge for the Muslims themselves. There are also Christians and (people from) other religious backgrounds; they are coming from backgrounds where religion is more visible,” she said.

Despite the debate, diverse faith groups have provided fundamental support to refugees and have functioned as more trustworthy and effective support services than those run by governments, Eghdamian said.

“These offer an alternative framework to show how religion can play a positive and constructive role in the refugee crisis, rather than fueling this dominant discourse of religion’s negative and destructive role,” she said.

This article originally appeared in Religion News Service.