Hi TBL. Sure, I understand God had a role in organizing the sacrifices. I'm talking more about the attitude of the people toward the sacrifice.
The words don't change, but the hearts of people change. Again, I feel this is why Jesus said, "this people draws near to me with their lips, but their heart is far from me". The tenants of faith are already written. That's why we have a Bible. Surely unity can be there without a selected list of verses from the Bible? And what about the parts which don't make it onto the list? I don't think I've ever seen a creed which includes something like, "We believe in working against greed and materialism, helping orphans/widows, and praying, fasting, and giving charity in secret", but those are fairly important practical teachings from Jesus.