This really is a good tough question, and the answer really depends on what kind of person you are. As for me, I absolutely love questioning and debating. In fact, I can get so frustrated sometimes trying to figure out how people, who would say something like 'live and let live', think and how their minds work, because that attitude is so foreign to me. I'm not saying that it is an inferior attitude, per say, its just not something I can easily understand.
Christians would say, of those who are not Christian, that ignorance is certainly not bliss, because to be aware of god's word is one's own resposibility, which if neglected, can earn you a ticket to hell. From an atheistic perspective however (aka, no afterlife), the seeming negative effects of 'false beliefs' are perhaps not as apparent. It certainly would be easy to say 'live and let live' because we do not believe in any supernatural consequences, however like Alaric was saying, the truth is out there, and wether we're happy with our lives as they are or not, it will come upon us all sooner or later.
Bottom line? I think that everyone should be open to other's opinions, with the thought that they can learn something. Questions exercise your mind, and yes Lighteeper, strengthen your faith. think of it this way: if your faith really is true and strong, what's a little questioning gonna hurt? *smiles sweetly and innocently* :roll: