The simple answer to that is yes, He is! If you believe Jesus died on the cross and rose three days later, then it is true that He overcame death, something no one else has ever done, and therefore is not still dead but alive (Acts 1:3).
Why is this important? As a believer in Christ, it is important that the God we have a relationship with is alive and always with us, working in our life daily. We need to be able to talk to Him through prayer and listen for a response from Him. It is important to see His influence in our life and feel His love in our souls, hearts, and minds. We are promised in the book of Romans that Christ who died and rose to life is seated next to God in heaven talking to God on behalf of those who believe in Him (Romans 8:34). We are told that until Christ comes back and walks this earth again, He will remain seated with God. Since Christ has not yet returned to earth, we can believe that all these years later, He is still sitting next to God, alive, interceding in our lives and working in our hearts daily.
Without experiencing it firsthand, it is hard to understand. We cannot tangibly see Christ alive the way we can see living humans or animals, and there’s no physical body to touch or see. But on the foundation of faith (believing without seeing), we trust that God is at work in our lives and alive in our hearts. One definition for the word alive is “in a state of action.” When I think of all the personal testimonies I’ve heard of Christ’s work in individuals' lives, it correlates with the idea of Christ in action. He makes a difference in the way His followers live their lives, transforming us into the people He created us to be, and for that I am thankful that He is indeed alive.