Is it possible for God to use a Christian while sinning?

I understand the desire to serve the Lord, but He expects us to be holy as we serve Him. It is true that believers are flawed people who serve the Lord. The most essential thing is that they are not living in sin. In order to avoid inviting God's discipline and trip up our weak brethren, we must shun sin in our daily lives. I am hoping that you will end your sinful relationship and reconcile with God so that He can maximize your life to the fullest. (Lk. 1:74-75; Heb. 12:6-7; 1 Jn. 1:6; Psa. 32:1-2)