This is exactly why I currently consider myself agnostic. I was raised in the Christian faith, and I was always taught that believing in God implies belief in the absolute truth (whether in a literal or metaphorical sense) and infallibility of everything in the Bible. There are many things in the Bible that I just don't agree with and cannot hold to be true. According to my early Biblical education, if God exists, then the Bible is all true and right. So to me, the fact that (I believe) that there are some very wrong and untrue things in the Bible implies that God is not real.
At earlier times in my life, I considered myself "saved" as was defined by my church at the time, I had accepted Jesus Christ as my personal savior and all that. Now I'm not even sure I believe in God, which according to this would be an unforgivable sin if I died right now. So am I saved or am I damned? This all seems very contradictory.
Who is to say?
Anyway, the first part is interesting, I have said things which you dont agree with do you think that perhaps I dont exist? I'm not being facetious and not trying to catch you out either (wouldnt dream of it) but do you see what I mean by drawing the comparison?