Dear Pradeep, Your question is atleast 2000 yrs old. While on the cross, Jesus was also asked this question. But it was not a 'Answer-in-one-word' answer. His own disciples understood Him LATER and not while He was with them. Later, Once they understood the truth, they were hell bent in preaching the "good news"(if u understand) that death has been won over, we need just to believe that Jesus dies for all Humans ONCE. NOt even one disciple of Jesus died a natural death, every one died simply because they were told not to preach and yet they preached.
