Actually, Christ is the basis for Christianity. I can't recall whether it was Fr. John Romanides or Metropolitan Hierotheos Vlachos who provided the lapidary phrase, "Christianity is a way of life based on a Person, not an ideology based on a text."
Wierd notions like 'Biblical inerrancy' only arose when protestants, generations removed from any organic connection with that way of life, tried to reconstruct the Faith using only the Church's principle books as their starting point. Nothing like the "Biblical Christian" attitude toward Scripture can be found in any of the Ante-Nicean Fathers, nor in the writings of the Cappadocians Fathers, nor St. Athanasius (all contemporaries with the fixing of the Christian canon).
I agree with what you wrote to a degree.
Christianity - as revealed in Scripture - is a relationship with Christ.
Where I sense I would disagree with you comes in how we know Christ. I believe it is through the revealed word alone that the relationship is formed and grows. Scripture is the basis for that relationship. And it is the "truth test" for all claims. Otherwise, we have only opinion instead of revealed truth.
If you are putting forth the argument that you can know the Person of Christ through any other means, then you have no way of knowing that the "Christ" you have met is not Krishna, or another imposter. Any teaching should be compared to the Scriptures - or else why was it so important to "any of the Ante-Nicean Fathers, ... Cappadocians Fathers, or St. Athanasius (all contemporaries with the fixing of the Christian canon)" to definitively declare which books were inspired of God? Hmmm? Apparently, the importance of this canon was apparent to them as it should have been. St. Paul declares that all scripture is inspired by God. Apparently he also believed scripture important.
In the absence of Scripture, do you rely on the men you quoted?
To close on where we agree with each other...
If someone knows the scripture alone, but doesn't have a personal relationship with the Savior, he is bankrupt.
best to you,