As an “intellectual” I must disagree. For me skepticism and questioning everything, trusting nothing unless I can prove it satisfactorily to my own mind leaves me with the greatest peace of mind. When I do reach a conclusion about something I can be comfortable in knowing that I truly taxed my mind to determine whether it is correct or not. When I am unable to reach a conclusion, I have one more goal to work towards (learning and thinking enough to reach a conclusion about the unresolved issue)and am acutely aware that I am not and never will be perfect, but constantly striving for perfection; I am aware of my limitations, and try desperately to overcome them with hard work and scholarly growth.
I take great umbrage at your equating intellectuals and skeptics with apikorsim. On the contrary, an apikores is likely just as bad as the pure emuna person: Both likely reach conclusions without regard for complete intellectual honesty and a healthy regard for their own limitations.
Personally I can not even imagine having any kind of peace of mind if I just took other people’s word for something.