Justin Taylor has a very helpful post dealing with levels of doctrine moving from the absolutes to those things that are open questions. Check it out HERE.
From the ESV Study Bible:
The ability to discern the relative importance of theological beliefs is vital for effective Christian life and ministry. Both the purity and unity of the church are at stake in this matter. The relative importance of theological issues can fall within four categories:
1.absolutes define the core beliefs of the Christian faith;
2.convictions, while not core beliefs, may have significant impact on the health and effectiveness of the church;
3.opinions are less-clear issues that generally are not worth dividing over; and
4.questions are currently unsettled issues.
Where an issue falls within these categories should be determined by weighing the cumulative force of at least seven considerations:
2.relevance to the character of God;
3.relevance to the essence of the gospel;
4.biblical frequency and significance (how often in Scripture it is taught, and what weight Scripture places upon it);
5.effect on other doctrines;
6.consensus among Christians (past and present); and
7.effect on personal and church life.
These criteria for determining the importance of particular beliefs must be considered in light of their cumulative weight regarding the doctrine being considered. For instance, just the fact that a doctrine may go against the general consensus among believers (see item 6) does not necessarily mean it is wrong, although that might add some weight to the argument against it. All the categories should be considered collectively in determining how important an issue is to the Christian faith. The ability to rightly discern the difference between core doctrines and legitimately disputable matters will keep the church from either compromising important truth or needlessly dividing over peripheral issues.
Diagram copyright 2009 Crossway Bibles.