Keep in mind, only God is omniscient. Only He has all the answers. And with our limited minds, there's always going to be something we dont know. Scratch that - there's always, so long as we're on Earth, ALOT we arent going to know.
But God does have all the answers - so we dont need to.
And what we do know is revealed to us by God through the Holy Spirit - not by dogmatist, and which can shout loudest, or impose their view the most forcefully.
It's only the knowlege that the Holy Spirit imparts to us that we can find peace and security in, and have faith in. Dogma from some human source is so weak and empty by comparison.
And the Holy Spirit imparts His understanding to each of us based on our unique capacities. And while those remain limited here on Earth, there's going to be "differences of opinions," because different people will be at different places in their growth. We can all find peace in knowing, though, that in heaven, we'll have all eternity to be with, and grow in understanding of, the infinite God - an experience that will never end.