John 1:29 The next day John seeth Jesus coming unto him, and saith, Behold the Lamb of God, which taketh away the sin of the world.

The Lord Jesus Christ suffered and died as a substitutionary payment for the sins of the whole world. He physically arose from the dead and then ascended into Heaven. Simple faith in this sacrifice is the only way of salvation for mankind.

 

Scripture Reference KJV
  Luke 24:7 "Saying, The Son of man must be delivered into the hands of sinful men, and be crucified, and the third day rise again."
  Acts 1:9-11 "And when he had spoken these things, while they beheld, he was taken up; and a cloud received him out of their sight. And while they looked stedfastly toward heaven as he went up, behold, two men stood by them in white apparel; Which also said, Ye men of Galilee, why stand ye gazing up into heaven? this same Jesus, which is taken up from you into heaven, shall so come in like manner as ye have seen him go into heaven."
  Romans 5:8-10 "But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us. Much more then, being now justified by his blood, we shall be saved from wrath through him. For if, when we were enemies, we were reconciled to God by the death of his Son, much more, being reconciled, we shall be saved by his life."
  I Peter 3:18 "For Christ also hath once suffered for sins, the just for the unjust, that he might bring us to God, being put to death in the flesh, but quickened by the Spirit:"