Your first test is invalid. You assume everything from God has to be in Scripture. The voice of the seven thunders is purposely omitted, yet will that not be from God?
For instance, the "assumption of Mary" - that was simply made up. It wasn't even declared "from the seat" until the mid 1800's. But there's no evidence for it, no basis for it, none. The church has a long tradition, and the church fathers wrote a lot - and there is nothing indicating Mary died anything other than a natural death. The same can be said of the issue of her perpetual virginity.
This gets into the thing that keeps me from the church (though other things attract me to the church, the liturgy, parts of the tradition, etc) - a lot of stuff that got added along the way. I mean, the Borgias bought into the Papacy, they had orgies in the Vatican. Am I supposed to believe that anything "from the seat" (or whatever they call it) by men like that is on par with the writings of Matthew, Mark, Luke and John or the Apostles Paul, Peter and James? Sorry, can't accept that.