Catechism in the Bible

Something I've wanted to do is run a Perl script against the NT books, counting the frequency count of root words, and seeing what comes of it.

But really I'd like to pull catechism closer to the Bible.  After all, if the Bible is our authority, it should be self-validating.  Of course it is a collection of books, rather than a proper compendium with an index.  Do you suppose that early persecutions prevented these books from coming together?  But of course Polycarp used most of the NT, and Clement used books liberally as well -- and both quoted them liberally as authoritative words.  So we know they knew which books were authentic.  Anyway.

Looking for a catechism, we still have to treat the NT books as independent books, written to particular people for particular purposes.  For example, the gospels were written for all people, including unbelievers ("so that you may believe...").  That's the first hunk of a proto-catechism.

But the epistles were instructions and correctives written to the leadership of churches (and often explicitly to be circulated amongst the rest of Christendom) -- in this case, 1 Corinthians 15 lays down the gospel.  That's the next hunk of the proto-catechism, worthy of memorizing verbatim.  Moreover are other obvious teachings being circulated which the apostles approved of, in a few quotes, but also the entire book of Hebrews, which is so meaty it's not funny.

I could go on, but I don't have my thoughts collected.