Generally speaking, I don't see the error being not putting Him first. I don't see all disagreements in Theology being a lack in allegiance to Jesus Christ. Things were hard to understand in the first century and some things remain hard to understand. There is certainly something wrong, but I think we're hard-pressed to be saying that everyone who disagrees with us lacks allegiance to Christ or does not have the Spirit, or is some agent for the adversary.
This doesn't mean I think everything goes, which is why I mentioned checking foundations first. Paul for instance levied his harshest attack towards those who would seek to destroy one's foundation and pull them from Christ and Grace and the new era in Christ.
So, I'm not a pacifist at the end of all of this, but, in truth, I've become more settled in my faith. No matter what I know or don't know, I know Him - I understand who He is, I believe in Him and understand that Biblical Faith apart from submission is nonsense, I understand what He's done for us, and what He's doing for us as He takes us individually and corporately to a telos for all His Creation, and in faith I am submitted to Him and His plan and process. His Father is my Father and He - Jesus YHWH's Christ - is my firstborn brother and Lord and everything His Word says He is.
Men are still crazy. Entering into Christ and having His Spirit doesn't make men uncrazy in an instant - maybe for an instant - but then the process begins. It takes a lot of time and a lot of focused work to make us more and more uncrazy. There's a lot of crazy on these forums and a lot of denominational antagonism. If I were an unbeliever reading this I'd see little value in Christianity. Honestly, I've come to see little to no value in what some to many men think Christianity is.
In some ways, we're not going to completely know Him and who we are in Him until we see Him as He is. So we or I at least just keep moving forward and growing in His grace and knowledge until our individual telos or until He brings it all to its telos. Part of the task is to rest in Him while collaborating with Him at His pace for us rather than ours. It's a blend of a tension in His Word of striving and giving it our all while resting in Him. There are a lot of such tensions in the Text. Epignosis is a practical knowledge, and experiential knowledge and we may think we know things but we really don't until we do. There's Life and then Abundant Life and there is a difference between the two.