What is the evidence of a life renewed by God?

The evidence of a person born of God, born again, or made a new creation,

is to love God whom God has made anew and to love brothers and sisters within the Lord

whom God has also made anew (1 Jn. 5:1).

This statement in the First Epistle of John 5:1

is similar to Jesus' twofold commandment in Matthew 22:37, 39.

In short, those born anew from God obey Jesus' twofold commandment.