Christian humanist?
You might want to rethink that assessment.
The two words of the term are ultimately at war with each other.
Butker’s spiritual life accrues to the glorification of God. He strives for greater and greater humility. Humanism has devolved into naval-gazing and deification of mankind at the expense of the virtue of humility.
There is secular humanism — which is what you have described — and there is religious humanism. Christian humanism would be the idea that true human fulfillment is built on the foundation of the incarnation of Christ and His teachings. You can see examples of that throughout Christian history, especially during the Renaissance (Erasmus, St. Thomas More) and it was revived closer to our own time by St. John Henry Newman, T.S. Eliot, and G.K. Chesterton. (What Butker said reminded me a lot of what I have read in Chesterton’s works.) I believe there is an element of that in the teachings of Pope St. John Paul II. The humility of Christian humanism is in its recognition that we cannot be what God has truly meant us to be outside of His revelation to us and His grace. Glory to God!