These are decisions by humans. Now, the claim is made that they are divinely inspired but consider this...

If the deity wanted something, any supernatural being should be able to make it REALLY clear what he/she/it wants. I'm talking about flaming letters across the sky. Rules carved into the side of mountains. What do we get? Someone claiming that "god spoke to them and god wants <X> "

The canons of the Abrahamic religions represent the decisions made by people with their own axes to grind. From the Council of Nicaea to the present day, church doctrine and what is "true" changes all the time.