I was scrolling through TikTok and watching some Christian content, and I was horrified by what I heard being taught. It was just as bad as the false doctrine of Once Saved, Always Saved. Certain so-called believers are teaching that Christians cannot sin. In Romans chapter 7, Paul teaches about the two inclinations, a concept found in Judaism. You have the Yetzer HaRa [the evil inclination] and the Yetzer HaTov [the good inclination]. Rabbi Paul describes the conflict between the will to align with God and the power of sin operating in the flesh. The believer has the ability to sin, or he has the free will to put to death his Yetzer HaRa, that is, his evil inclination or sinful passions.

In 1 Corinthians 9:27, Paul disciplines himself "lest after preaching to others I myself should be disqualified.' In Galatians 5:19-21, Paul warns believers that those who practice the works of the flesh will not inherit the kingdom of God [Messianic Age]. Paul was writing to baptized, Spirit-receiving believers.

The apostle John says that if anyone sins, we have an advocate. He also says, If we say we have no sin, we deceive ourselves (1 John 1:8, 1 John 2:1).
The author of Hebrews says that any believer who deliberately sins after receiving knowledge of the truth has no more sacrifices (Hebrews 10:26-29). In other words, Christians can sin. 2 Peter 2:20-22 says that escaping the defilements of the world, then entangled again in them. That is going back into sin.