Marching, with firearms, protesting the building of a religious house of worship, or school, or cemetery is wrong in so many ways....legal, of course, as long as it's peaceful but I wonder how I, if I were an American citizen who is Muslim, would feel seeing that.
Angry. Not at them, but at the people committing atrocities in the name of my religion. These people are reacting naturally to what they see as a threat to their safety. My faith has only itself to blame for not reining in these blasphemers who kill in the name of Allah.
Hopeless. Because no matter how much I try to convince them I'm not like those terrorists overseas, they will simply dismiss it. No matter how many times I assert my faith as a "religion of peace" they will contend otherwise, naturally with the atrocities committed on 9/11. By radical Islamic terrorists.
Afraid. Because there could come a time when another large scale terrorist attack is carried out on American soil, by a member of my faith, and then those same people protesting with their firearms will only become more hostile to me and people of my faith.
Isolated. Because each time there is a terrorist attack on American soil, the first thing people will do is see if people of my faith were responsible for it. It would make me feel different and wary.