God just wants mankind to repent. That said, it is faith in Christ that saves us. We need to come to faith in Christ first, then he will clean us up in the process of sanctification.
To learn what repent means, we look at the Strong’s Concordance 3340 definition of repent,
Gloss: to repent, to change any or all of the elements composing one’s life: attitude, thoughts, and behaviors concerning the demands of God for right living
Repentance is turning from sin, and turning towards Jesus!
Everyone in Jesus Christ is on their own process of further sanctification, until our bodies will be redeemed at the first Resurrection.
If anyone claims to be perfectly Holy in this life, we have the Law which is the school master to bring us to Christ! Everyone has broken the law in one way or another so all human beings are guilty.
John the baptist preached the message of repentance to prepare a way for Jesus, and in Mark 6:12 Jesus sends out his disciples preaching the message of repentance. The Gospel is supposed to bring man to repentance.