Why is crucifixion a symbol of Christianity? This is a painful death, why is it not a symbol of torture?
I think this symbol gives rise to a feeling of compassion, waking up the soul, and compassion is the symbol of humanity or Homo sapiens (Human).
Cross, the principal symbol of the Christian religion, recalling the Crucifixion of Jesus Christ and the redeeming benefits of his Passion and death. The cross is thus a sign both of Christ himself and of the faith of Christians. In ceremonial usage, making a sign of the cross may be, according to the context, an act of profession of faith, a prayer, a dedication, or a benediction.