My big shock was in discovering there were NO ORIGINAL MANUSCRIPTS in the whole wide world!
I remember when I began looking for the Truth in the Bible thinking that I would dilegently search the scriptures for the one true doctrine and discovering the fact that there are no original manuscripts and thinking how am I supposed to know what the authors really wrote? Copies of copies of copies with numerous errors in them, some intentional while others due to fatigue or human error. If the argument could be made that the Bible was written perfectly and transmitted God's message perfectly, we have no way of knowning without the original manuscripts.
I've ultimately concluded that if there is a god then none of the world's religions accurately depict him.