One who willfully and habitually sins has never really been born-again. Going to church and tithing do not a sinner cleanse.
The promise of Jesus advocacy is to the covenant believer, not the casual religionist. “If” one sins recognizes the possibility to fail or stumble. “Willful” and “habitual” sin has no Advocate. Only heartfelt repentance and yielding to Jesus Lordship will open the cleansing font of Jesus Blood.
The offer of redemption’s cleansing is to whosoever will. Repent, confess, receive, and believe (Romans 10:9,10). Then, walk in the Spirit, not in the natural, carnal nature and enjoy Jesus as Advocate on your behalf.