Doug Wilson gives, I think, a helpful hierarchical grid in seeing differing degrees of doctrinal disagreement. After giving an introduction to why we need this, he lists 7 levels. Here is what he says,

Part of our problem is that our standard of definition for heresy naturally tends to be set by what flies in our own circles. But if this is unwatched, it turns into radical sectarianism. If it is unwatched in the other direction, it turns into pomomush.

Let’s approach this as a practical problem. There are ascending layers to this.

1. On the same page, as sort of a twins separated at birth kind of thing;

2. On the same page in most respects, such that you could speak at the same conferences for years without encountering any real disagreements, although they are there, and the whole thing is grand;

3. Different in significant respects, which are kind of obvious to everybody, but they are doing good work over there and you want to be friends anyhow;

4. Different in significant respects, and the differences if followed to their logical conclusion (in your considered opinion) will lead to serious damage to the Church down the road;

5. Different in significant respects, and the damage is being done to the Church right this very minute, but enough about Brian McLaren;

6. Different in a way that reveals these guys to be flaming heretics of the sort that would make Arius and Servetus blush;

7. Satan spawn.

Of course there are going to be some grey areas around each point. Even still, I think this is a help grid to see the different layers of doctrinal disagreement.