Bible-Believing Christians

I was reading Matins this morning, and the first lesson was the latter part of Numbers 14. Afterwards, I noticed that the first lesson tomorrow morning will be from Numbers 16. "Hmm," I thought to myself, "what's in chapter 15 that we're leaving out?" Perhaps this. (I understand why certain verses don't get read, but I'm not always sure that's the best idea.)

Numbers 15:32-36: When the Israelites were in the wildnerness, they
found a man gathering sticks on the sabbath day. Those who found him
gathering sticks brought him to Moses, Aaron, and to the whole
congregation. They put him in custody, because it was not clear what
should be done to him. Then the Lord said to Moses, "The man shall be put
to death; all the congregation shall stone him outside the camp." The
whole congregation brought him outside the camp and stoned him to death, just as
the Lord had commanded Moses.

All you "Bible-Believing Christians," please help me understand what to make of that. Especially all you Bible-believing Anglicans over there at the GAFCON conference.

Is there anyone who can help me understand why "Bible-Believing Christian" isn't an oxymoron? Please let me assure you: I do believe the Holy Scriptures of the Old and New Testaments to be the Word of God, and to contain all things necessary to salvation. But it seems to me that first we must believe in (have faith in) Jesus Christ, who is the Word of God in the first instance, and only then are we able to understand how the Scriptures are the Word of God.

And if you GAFCON folks and your associates are of the opinion that Numbers 15:32-36 is not binding upon us now, then was it ever binding upon anyone? Why, or why not?

Enquiring minds want to know.