My one piece of advice would be to make sure that your society/group doesn't appear to be exclusively for Muslims.
Advertise it as coming from a Muslim view on terrorism/extremism, but that you're open for people from all faiths to join in discussion.
Otherwise, since you're already facing adversity from people who distrust Muslim people, your group being "Muslim Only" may look suspicious, even if it's discussing the same views that those people have.
Basically, just allow anyone in, but try to focus on this coming from your muslim view.
And create rules for your society to explain that you're not here to debate the differences between the religions. Keep your discussions on track, and set a theme/topic for your meetings, whether it's the particular teachings of parts of the Quran, or a muslim leader, or an event that has happened in the news (such as the recent beheadings), etc...
And consider searching for speakers who may be willing to come and talk to your group. (Just have a chat with the person before they come though, since often the most willing speakers tend to be a little bit on the extreme side of whatever they're talking about, and you don't want to alienate anyone attending your sessions).
