Sacrament of Resurrection, part 2

Why is the sacrament of resurrection considered to be the core of the Christian faith? What does it mean to believe in the miracle of resurrection? Is it a miracle in reality? Perhaps the faith for resurrection is meant to overcome the fear of death? Is it human to doubt in the resurrection of Christ? Is faith and resurrection subject to be scientifically proved? 21 centuries have passed since the resurrection of Christ, has the human understanding of Resurrection changed since then?

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