M
I don't think this is a "moral" decision per se, so talking about right or wrong is moot here. I think it depends on what your calling is and whether you are heeding to it or not. In the case of Corrie ten Boom or Rahab (from the Bible), I think their calling was to shelter the oppressed and to provide an escape route for them. Eventually, God considers that alone, and the rest has little significance.
If God has called someone to provide a shelter to the Syrian refugees, even if they are Muslims, then that person has to provide a shelter to the Syrian refugees. He/she cannot reason with God and say, "Lord, but they could be terrorists!" God would probably reply, "And you were a sinner before I saved you!"
If God has called someone to provide a shelter to the Syrian refugees, even if they are Muslims, then that person has to provide a shelter to the Syrian refugees. He/she cannot reason with God and say, "Lord, but they could be terrorists!" God would probably reply, "And you were a sinner before I saved you!"