You got it. Of course to have no self-doubt whatsoever would be non-Jewish in nature; we must necessarily doubt and ask questions in order to make our faith all the stronger. However, the kind of left-wing self-hating doubt that is all too common, and the doubt that stems from trying to be secular and devout simultaneously, is not present with the Lubavitchers, in my admittedly limited knowledge of the group.
May I ask how you classify yourself within Judaism, and do you have that self doubt you talk about? If you don't want to answer that's fine, I don't intend to pry. This thread is touching on things that have been primary in my thoughts lately, so I'm very curious where we all are coming from.