You are absolutely right that pride is the problem, but not in that they assume they are right, we all do that. Their pride is that they think they are right and are unwilling to continue learning and studying. No individual is 100% right about everything (other than perhaps Christ, but he himself confessed he only acted as the Father directed him to act). So we should all be willing to acknowledge and accept, without exception, that while we are right in some areas we are not right in others. I think the same could be said of denominations within the church. While one denomination is right regarding one doctrine, another denomination is right regarding another. I don't think it is a question of if each group is right about some things and wrong about others. It is a question of which things are we right about and what are we wrong about.