“If anyone is ashamed of me and my message in these adulterous and sinful days, the Son of Man will be ashamed of that person when he returns in the glory of his Father with the holy angels.” Mark 8:38 NLT

‘Rebellion’ carries with it a negative tone. The word is defined as, ‘armed resistance to one’s government, or defiance to any authority.’ A rebel is one who takes part in resisting authority. Certainly, this is not what a Christian should be involved in. I agree with that under most circumstances. But Christians have a higher authority to answer to, the Lord God creator of heaven and earth.
Christians are to be rebellious. We are to rebel against the sinful nature of our flesh and the evil Satanic ways of the world. Modern-day theologian David Guzik writes in his commentary, “ Most people think of following Jesus as conforming to the establishment. Actually, Jesus called us to rebel against the established order of this world. We are called to rebel against the tyranny of the flesh, against the fear and conformity of the world, against the traditions of man. Jesus encourages a slave rebellion, where the slaves of sin, Satan, and the world rebel against their masters.” (1)
The current world system is corrupt in every way. Flagrant immorality, thefts, murder, abortion, fraud, deception, and the list goes on. Many of these vices along with others are found in most governments, businesses, organizations, communities, families, and individuals who follow a secular worldview. Satan is influencing every social class and moving people away from the things of God and promoting his Satanic ideals. He is the prince and power of this world system. The apostle Paul makes that clear in Ephesians 2:2, “You used to live in sin, just like the rest of the world, obeying the devil—the commander of the powers in the unseen world. He is the spirit at work in the hearts of those who refuse to obey God.” (nlt)
We are living in a world between good and evil. Jesus Himself declare this world as adulterous and evil days. It is time for all Christians to rebel against our sinful flesh and the urge to conform to the world system which is under the control of Satan.
(1) https://www.blueletterbible.org/comm/guzik_david/study-guide/mark/mark-8.cfm?a=965038