That's a really interesting and important question. The belief in Jesus despite the absence of his physical body is central to Christian faith and rests on a few key ideas:
* Resurrection and Ascension: Christians believe that Jesus was resurrected from the dead, meaning his physical body was transformed and he rose to new life. They also believe he ascended into heaven, meaning he physically left the earth to be with God the Father. This doesn't mean he ceased to exist, but that he exists in a different form and place. The empty tomb is seen as evidence of the resurrection.
* Spiritual Presence: While Jesus is no longer physically present, Christians believe he is spiritually present through the Holy Spirit. This presence is experienced in prayer, worship, community, and acts of service.
* The Body of Christ (the Church): The Church is often referred to as the "Body of Christ" on Earth. This means that Christians are called to embody the teachings and actions of Jesus in the world, continuing his work of love, justice, and reconciliation.
* Faith and Trust: Ultimately, belief in Jesus is a matter of faith. It's about trusting in the accounts of the Gospels, the teachings of the Church, and the personal experience of God's presence. It involves a commitment to follow Jesus' example and live according to his teachings, even without his physical presence.
* Emphasis on the Spirit over the Flesh: Some interpretations emphasize that a focus on the physical body is less important than the spiritual reality of Christ. Paul, in the New Testament, talks about knowing Christ "no longer according to the flesh" (2 Corinthians 5:16), suggesting a shift in focus from the physical to the spiritual.
It's important to note that these are just some of the key ideas. Different Christian denominations and individuals may have varying interpretations and emphases.