Why is it important for Christians to understand the concept of being 'not with Christ'?

Jesus clearly states in Luke 11:23 that 'He that is not with me is against me.' This highlights a critical theological truth: there is no neutrality when it comes to Christ; individuals either belong to Him or are in rebellion against Him. This urgent message stresses the importance of faith and allegiance to Christ for salvation. It serves as a powerful reminder that humanity, in its natural state, is already in opposition to God unless redeemed by His grace. Therefore, it compels us not only to evaluate our own position in relation to Christ but also to evangelize others who remain in opposition, emphasizing the exclusivity of salvation found in Him alone.