Obviously. But that doesn't help your arguments one bit IMHO.
Further the majority coming are not from war zones or facing persecution. Illegals care coming in from as far as Bangladesh, Pakistan, Algeria, Iraq, Afghanistan, Nigeria and many have not even applied for Asylum. The identities are known to exist in part from discarded documents. Few families are coming along. Location alone is not a security risk; lack of security is the risk.
Still not an argument to deny refugees entry.
Despite its faults Syria was a secular society which tolerated all types of religion. After allied intervention and support of rebel factions ISIS has tried to remove all 'non'believers' from the Syrian society. The same happened in Iraq.
How is this relevant for your arguments?
There are some among the Arab and North Africans especially among the uneducated and illiterate who think they can misbehave in a foreign country. Whether this is a small percentile or not does not detract from the need to operate strict entry procedures to protect our own populations (from all backgrounds).
There's a small percentage among any group who think they can misbehave. That's just a fact of life. I'm still not sure how this helps your arguments? Are you somehow arguing that Europeans don't commit crime?
The general theme of racists arguments is that people from the Middle-East are more criminally inclined than Europeans. They conflate all manner of statistics and ignore common human characteristics we all share. When there's a cultural shift or people are removed from their cultural context and put in another this leads to all manner of unwanted transgressive behaviour. In sociology this is called "anomie" and there's tonnes of studies on it. But whenever they feel secure again and they exist in a cultural context they recognise this effect disappears. Just one example of how racists are just fucking dumb-ass and above all apply double standards. Most importantly this is a universal characteristic of all humans.
Just one example. There's loads more.
If we allow in refugees there will be problems. Lots of problems. It'll be messy. I'm not questioning that. But they are refugees. And I think that over-rides any other concerns. That's just my firm belief. Once the war is over and Syria is at peace again they will remember how they were treated during the war. That isn't a threat btw. This is an opportunity to make friends.