Built into the very concept of Christianity is the idea that no human can perfectly live the life espoused by Christ. It is why Jesus gave The Twelve (and their successors?) the authority to forgive sins:

* https://en.wikipedia.org/wiki/John_20:23

* https://en.wikipedia.org/wiki/Sacrament_of_Penance

* https://en.wikipedia.org/wiki/Confession_(religion)

There was an early Christian heresy what believed that clergy must be faultless for their ministry to be effective and their prayers and sacraments to be valid:

* https://en.wikipedia.org/wiki/Donatism

And another belief that humans can be saved by their own efforts, without the need for God's grace:

* https://en.wikipedia.org/wiki/Pelagianism

In some ways your idea would be contrary to scripture (?): since no one can (fully/perfectly?) live those values, then no one can (fully/perfectly?) be Christian. Whereas is in the 'Lewis model' every one can be a Christian, but just a better or worse 'instantiation' of one.