That’s a good point. We can probably narrow it down some. I just know that even within my denomination that tries to say it’s not a denomination (church of Christ with a purposeful little ‘c’), there are splits based on doctrinal things, and we can’t all be right. Some of the doctrinal differences between major denominations are much more significant, to the point of being competing ideas about how one becomes a Christian and other such things. The Holy Spirit isn’t leading different groups into different ideas about how one becomes a Christian, right?
A friend and I have been chatting about this quite a bit recently. We’ve concluded that the fundamental difference between many churches is style. However to justify the style of service they like, Christians often decide that their preferred style must be what God prefers and then justify that by creating doctrine.
That’s not to say their isn’t real doctrinal differences. However once you get by the basics (captured for example in the Nicene Creed), I think it’s arguable that a lot of what is considered doctrine is based preferences of interpretation. I’ve concluded that I don’t think God really cares much about many of the things Christians want to argue about between themselves.
There must be cultural and social differences between Christians, since they are people too, but there shouldn’t be doctrinal differences if the same Holy Spirit guides us all. What is doctrinal truth in the US, should be same in Europe or anywhere else.
Its expected that humanists would differ in opinion on certain humanist “doctrines” since they are not spirit-led, but we shouldn’t expect the same of Christianity.