Today, for Christians, the only sure thing they have for a guide is the bible. All else is tradition. You can say all matter of things against the bible, but that doesn't invalidate what makes up the Christian religion. So, it's either the bible and Christian, or it's nothing, in my thinking. So, either God left us with a guide book for these last days, or it's all bunk. Generally, those who choose "it's all bunk", have never devoted a large portion of their lives studying it. I could easily say the same thing about today's science, because I've not spent a large portion of my life studying it.
