It might be helpful to compare how the full blown Catholic understanding, say, of Mary developed out of the Scriptural and early Christian understanding of Mary with the way an oak tree develops from an acorn. In each case, the before and after look different but are essentially the same. And one naturally leads to the other just as promise leads naturally (on a good day) to fulfillment.
Integral to Dembski's idea of specified complexity (SC) is the notion that something extrinsic to evolution is the source of the specification in how it develops. He compares SC to the message sent by space aliens in the movie "Contact." In that movie, earthbound scientists determine that radio waves originating in from somewhere in our galaxy are actually a signal being sent by space aliens. The scientists determine that these waves are a signal is the fact that they indicate prime numbers in a way that a random occurrence would not. What is interesting to me is the fact that Dembski relies upon an analogy with a sign rather than a machine. Like a machine, signs are produced by an intelligent being for the sake of something beyond themselves. Machines, if you will, have a meaning. Signs, if you will, produce knowledge. But the meaning/knowledge is in both cases something other than the machine/sign itself. Both signs and machines are purposeful or teleological...
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So the Old Eve / New Eve contrast alluded to, I think by Iraneaus (or was it Ignatius -- I get those two guys mixed up) is a kind of acorn from which the doctrine of the Immaculate Conception developed.
As for intercession of the saints, that is very, very helpful inasmuch as it undercuts the possible claim that the Catholic focus on the saints is an adaptation of the Roman Pantheon. But if ancient Jews understood Elijah as you say, then the doctrine of intercession was already "oakie" to begin with (I probably should avoid such wordplay when in Oklahoma).