Ed, as you may already know, Rainy and I have had very strong disagreements on many doctrinal issues and she has come down really hard on me at times too, and vice versa. But I've never taken anything she says to me as a personal attack. Even if she told me I was on my way to hell, I still wouldn't take it as a personal attack.
So all I am defending with Rainy, and I would do the same with you, is her right to believe what she believes without it being considered a personal attack. So if she believes those who don't believe Jesus is God are in danger of hell, and she believes that based on what the bible says (his word, not hers) that is not a personal attack towards you or anyone else.
But yes, you are correct, the disagreement over whether the bible is inerrant or not, is a dividing line, and I agree with Rainy, how can we possibly debate anything pertaining to Christianity without an authoritative standard to compare our differing beliefs to? There is no need to answer that question because I already know the answer. It is impossible!