Are any Christians completely void of skepticism?

I remember having skepticism as soon as I started being indoctrinated, and that was when I was in grade school (before I knew anything about evolution, or any other alternative views). One of my earliest memories of skepticism was when we were told to draw a picture of God in Sunday School. I drew an old looking man with a grey beard, and thought "this looks a lot like Santa Claus" and then I thought "how can I know this is what God looks like, I've never seen him". Then I asked the teacher "what does God look like", and she said "no body knows". I then remember just being overwhelmed with skepticism/doubt (for the obvious, logical reasons).

I wonder if any Christians go through life have no skepticism of their religion. Obviously Christianity frowns upon skepticism (a protective mechanism of the belief system), but it seems hard to believe that all true-Christians don't seriously doubt their faith from time-to-time.

I believe most Christians are closeted atheists that hope they are wrong.