Jesus spoke about resurrection to his disciples. The Pharisees, believed in the resurrection of the dead, but it was for a future promised event. The Sadducee's just couldn't see it, because their unbelief just wouldn't allow something that miraculous. People doubted it even after it happened, because it required that some skepticism that this was not medically possible. Others thought it a ploy to raise hope for the hopeless, or maybe it was for young children or old people.
I don't know what you believe about the resurrection, but I can tell you that over 500 people declared by record of a resurrected Jesus. People witnessed Lazarus being raised to life by Jesus In which he delcared I am the Resurrection and the Life (John 11:25), and in Mark 5:41 (KJV) And he took the damsel by the hand, and said unto her,Talitha cumi; which is, being interpreted,Damsel, I say unto thee, arise. and she arose as witnessed in two separate gospels (Mark and Luke).
Jesus is really the Raiser of lives and as a person of faith I can declare to you that He truly is the resurrection and the life. Jesus is the only person who can raise you in the newness of life choose him today, and he will raise you up to a new life!!!