Shalom Chaim,
In the city where I live, there are a lot of Muslims. Sometimes when out in public, I will see Muslim women with the full veils over their faces or, in some cases, their entire bodies. When I see them, I am filled with a desire to stop them, take them aside, and tell them that they are part of an evil religion and that they're letting themselves be used by it, and that the prophet that they worship was a vile child-rapist. I just want to lecture them about how they are letting a horrible force control their lives. Sometimes I see young Indonesian women wearing the Muslim head scarf and they are really quite beautiful, it just breaks my heart that they're involved in this sick cult. I have this intense desire to give them a piece of my mind and tell them that they should abandon it, (in a completely non-violent and non-threatening way, I should add.)
Should I act on this? Part of me feels like it is just such an easy target, and that it's somehow dishonorable to accost women this way. But the other part of me realizes that there are Christian missionaries all over town who probably approach these women and try to get them to convert to Christianity - so what is the harm in one Jew simply telling them that their religion is wrong?