It's simple, they are Satanist in Arabic they are inspired by Shaiton.
When a Muslim gets ready to pray or speak he will say, " Ow, ud zu belay he min a Shaiton, ar razheem." (Sorry, I've butchered that up) in order to ask God to keep the Shaiton from messing up the words said.
There are no icons or nonsense in a mosque to distract you from praying.
Certainly a Christian will not want to practice as a Muslim but in order to serve, minister or do business with a Christian will respect the property of all people. Jesus didn't go into the Pagan Temples or Mosques (yes there where no Mosques in his time) or Zoroastrian houses of worship, turn tables over and chase the money changers out. He wanted to repair the Jewish house of God!