Why do Christians face struggles despite salvation?

Despite the assurance of salvation and the promises of God, Christians experience struggles as they navigate the complexities of life in a fallen world. The presence of sin remains a reality, causing believers to grapple with their old nature and desires that conflict with their new identity in Christ. Additionally, spiritual warfare is a constant theme throughout Scripture, emphasizing the challenges that arise from external and internal temptations. Romans 7 illustrates this conflict well, as Paul describes the struggle between the desire to do good and the reality of sin at work within him. Nevertheless, Christians are assured that their salvation is secure and that trials can be used by God to refine and strengthen their faith.