Total "unity" of belief has never been and will never be possible because  finite beings are not of an infinite quality to know exactly what is correct and incorrect.  We do have inspiration from the Holy Spirit but She can only attempt to influence our finite minds.  Because we are only finite, it is often true that some beliefs are right and wrong at the same time.  I know that is a hard thing for dogmatic believers to get their minds around but as a scientist, it is much easier to understand. Good theologians have understood it for a long time, but because of our own human fear, we want to know what the rules are and seek dogmatism, but it turns out to cause a human rule by regulation and is seldom very loving.   Fact is this type of authoritarian rule can never take us very far...