Thanks for your detailed answer, c0de ;-).
Unfortunately, there are no forums, neither Islamic nor Interfaith, where you can discuss Islam in a serious way. Some are used for propaganda, others are strongly moderated and most questions from Non-Muslims are not approved or just no one answers to these questions.
I could conclude that Muslims do not like to discuss in public, either because the members of the forum are no experts in many areas and hence an Iman is the right person to talk to privately or because they don't want to see some questions raised in public or whatever reason. Why does this have to be the case?