Why is the doctrine of salvation through Christ important for Christians?

The doctrine of salvation through Christ is pivotal to Christian faith, encapsulated in the belief that through His sacrifice, believers are granted forgiveness of sins and eternal life. This is articulated in Ephesians 2:8-9, emphasizing that salvation is a gift from God, not a result of our works. Recognizing that this salvation is immutable—'the same yesterday, today, and forever'—provides assurance that it is securely anchored in the finished work of Christ rather than dependent on fluctuating human actions. This stability of salvation comforts believers, reminding them that their assurance rests on Christ’s unchanging nature.