This is a controversial topic. One of my most controversial so far. But it has to be said. Now there are different types of headcoverings for different religions.
People are identified by how they look. You can tell a catholic nun by her habit. You can tell a muslim woman by her hijab. Now you know EXACTLY what they believe in or stand for based on their choice of clothes. Why would you go an confuse people as to what you believe in?
When a Christian wears hijab (and don’t think they aren’t out there cause they are), it gives the false idea that they don’t believe in Jesus as their Savior. It makes them appear muslim. They are actually representing another god.