I have a short answer and a long answer. I'll give the short one:
It is rational, anti_nietzsche, because many are called and few are chosen. It is rational because there is a narrow, difficult path and a wide, easy one. It is rational because God planned it that way and does as He will, not as man wills.
Take your suggestion to its logical end.
To suggest that all Christians would be granted the same, precise, concise interpretation of scriptures is irrational and counter to the gospel. The road would be easy then and all who are called would have to be immediately chosen. Since God wills all to be saved, that means He would have to call and choose ALL men to hear the good news. No man could have the option of saying no in that case. Such a thing is ultimately irrational because the end result (UR) could only happen then through the loss of our free choice to learn Love as He lived (and died because of) it, and that lets out the possibility of a true Love relationship between God and His creation.
We will all be reconciled to God through Christ in the end, but it will be a free will choice by ALL creation that comes from a Godly understanding of what Love actually is, each group learning to Love as Christ did in the logical and natural order ordained by God. Not a forced obedience of automatons, cookie-cutter Christians.
To do that Jesus made the road to the Father narrow and told us we could only walk it if we went the same places He did out of love for others. Christ first, then the firstfruits in Christ, followed by His Bride after her testing, and then the reconciliation of all the rest of creation. Each step is necessary to the next. And very logical and rational :)