Hi MEC,
I agree, good topic.
I think the Holy Spirit teaches, and leads, and God will refine His Truth in us because of our doctrine (which can serve to protect us) and in spite of our doctrine (which can be an idol unbending to God's Truth). I think God uses tribulation to break us because of our pride and carelessness in this area. I see some who strictly adhere to a doctrine, or parts, and I see others, who do not adhere to a doctrine in title, but certainly have a set of beliefs (doctrine?). I know beautiful, humble, believers in both camps who have been an example of a follower of Christ before me.
I think we all have a doctrine, and we can count on the fact that parts of it are false, and that our methods and application of the Truthful parts are lacking as well. The believer, desires to be discipled by Christ...this person simply loves God, and others, and seeks to learn at His feet...to know Him, be like Him, and glorify Him. I think that it must be possible to have this mindset...Love God with all your heart, mind, and soul, and still have a doctrine. The Bible teaches us doctrine, and we all have one in some form.
I see no reason for us to all agree, or for us to compromise our beliefs to be unified. I don't think our beliefs will lead us away from the Truth, if we are truly His, and are obedient to Him by putting Him first and others before ourselves. I think our beliefs, even the wrong ones, will lead us closer, because of God's process of teaching us by helping us unlearn the things of the world...and to steer from new false teachings that arise in, and out of, the church.
God has a reason for all parts of the body, and if someone, or some denomination, is one of those parts we do not have to understand, agree, or include...God will do that. We can adhere to a main-stream doctrine, or we can be more of a gleaner, but I don't think one somehow will equal more Truth than the other. I do not believe it is good to be swayed by every wind of doctrine, or to be unbending before God, and so we must pray for wisdom, discernment, and study go show ourselves approved unto God to learn how to manuever through both pitfalls. We should move when He directs, not because someone has a good argument, or because we like most of their other teachings, or because we like a new idea...or an old one, or because we are sentimental and desiring to include all people and ideas. We must walk by faith, not by sight. Christ is the head of the church, and we are to simply submit to Him, and know that He has it under control.
The Lord bless you.