Being a Christian does not mean that I cannot admit my doubts. There are some great treatises written by Christians through the years as they struggle with doubt and questions. The writings of Mother Theresa reveal her struggle with faith.
Being a Christian is about persevering through doubt. I began my life as an agnostic, and my journey led me to belief in YHWH. I never doubt that He exists, but I sometimes find that what I believe about Him is wrong. A scientist may question a theory without questioning the laws that underlie that theory.
I am a Christian, just not one of those that thinks he knows everything because he believes in God.
My faith does come from a line of reasoning that will not stand up to a logical analysis. This does not make my faith less real, or even invalid. That also does not mean I am not willing to present a basis for my faith through argument. It just means that I acknowledge a inability to prove my faith through logic.
Does the fault lie in my faith? My ability to use logic? Or perhaps in logic itself? My belief is that it is the latter, because in order to make a logical argument proving the existence of God we would first have to agree on a definition of god, something that is impossible under logic.