This seems like one of those questions that the answer is self-evident.  Just look at the carnage in modern American churches that are fractured to the point where the gospel is unrecognizable.  It’s sometimes over petty things, but mostly the splintering seems to be over disagreements about Bible doctrine. 

The splits are usually preceded by statements such as, “Well, we believe this way and if you can’t agree maybe you’d be happy somewhere else.”  

But please consider: Maybe the problem is not doctrine itself.  I think the New Covenant community in its infancy allowed that there would be differences in theology and loving toleration of immature doctrine was encouraged (see 1 Corinthians 8 and Romans 14 as examples). 

The exception to this was where any work of law, any work of ritual religion was taught as required before one could know the love of the Heavenly Father and be accepted in the New Covenant community.  This legalism was rejected by the apostles with extreme prejudice and condemned as anathema (see Acts 15 and Galatians as examples).

So, I don’t think doctrine divides so much as a legalistic application of doctrine.  When a certain teaching or theological system takes on sacramental value (having the ability in itself to bestow holiness or grace) then that teaching or theological system takes on the same character in the eyes of God as the temple system Jesus destroyed.

Yup, I’m standing by that. Think about it.