Why do you believe you understand the Bible, especially the New Testament?
Is it important to also understand the Old Testament?
I think one reason I'm confident in my understanding of the bible, is because of the time I've had to read it and struggle through understanding it. For this confidance I think it's important to read both the New Testiment and the Old Testiment, and to listen to those who've read it and understand it more then you, like in group bible studies.
That said, I agree with WIP. I don't understand the bible completely. It's probabley more on the aspect of what I think I do understand, I'm confidant about it. And on the things I haven't heard before or agreed with yet, I'm confident in my knowledge to filter out the purely BS teachings that don't line up with scripture in one way or another.
My hope is that our understandings are second to our faith. That if we know and trust the core elements of believing in God, believing in Jesus, and knowing our sin (and His salvation); then our faith in God and Jesus will save us more then our knowledge base. That's one of my main hopes because there's no way I can earn God's salvation. Either through right living (even though I try I fail too often), or through right knowledge and understanding (there are too many perspectives, philosophies, and theologies to swim through in Christian enviornments that my hope is in God not in my understanding).
Did you learn from reading it?
From studying under the guidance of a church?
Studying theology?
From the Holy Spirit?
Why do you think you are right in your theology?
I grew up without a church foundation. Not that I didn't have church growing up, but I don't think I count a specific church or a denomination as my foundation. So all the differing views were part of the growing in knowledge, and the fear of being saved by right knowledge or not.
I hope the Holy Spirit has guided me, but I never know. What is from God, and what is from me? There are those who seem more confidant in discerning what is from God. I envy them and hope they are right.
Pick one or all.
It's problematic to me that we are not united in our beliefs.
Two thoughts. Paul argued in his letters that if anyone tells you a gospel different from what he gave them then to reject it (even if it came from Paul). This seems to speak about Paul's ministry and about the foundation on what he taught the churches. Even though we don't have that experience we have his letters and the importance of a solid foundation. The second thought (also from Paul) is that we are all one church body, even if we have many parts. Like a human body we need each part and cannot say that we don't need another part.
Both of these teachings seem to deal with division and with weeding out wrong teachings. Try to let our faith be our uniting element, and encourage both a solid foundation from what you know is true, as well as encourage a Christian love. Because that's how Jesus said we should be known and recoginized, by our love for one another.