while i agree that we are meant to uplift each other, i do not think that, in a debate, one must guard against changing another's mind.... that's the very idea.
besides. if your faith is such that one person not believing what you believe will cause it to crumble... you're not going to last very long in this world. EVERYONE is going to say to you 'the whole bible is crap and god is a figment of your love-starved imagination'. why should it be a challenge to your faith if someone says 'i don't like this book or this verse, but it doesn't change the fact that i believe in this god'?
note he only discusses the things on which he is sure of his belief and he doesn't delve into his struggles here. (we're friends irl and discuss this all.the.time.)