What many liberal theologians believe about Jesus' death
“Many liberal and some mainline Christian leaders believe that Jesus died during the crucifixion, did not resurrect himself, and was not bodily resurrected by God. At his death, his mind ceased to function and his body started the decomposition process. Returning to life a day and a half later would have been quite impossible. The story of having been wrapped in linen and anointed with myrrh seems to have been copied from the story of the death of Osiris -- the Egyptian God of the earth, vegetation and grain. The legend that he visited the underworld between his death and resurrection was simply copied from common
Pagan themes of surrounding cultures. One example again was Osiris. "
With his original association to agriculture, his death and resurrection were seen as symbolic of the annual death and re-growth of the crops and the yearly flooding of the Nile." 1
They also believe that Paul regarded the resurrection to be an act of God in which Jesus was a passive recipient of God's power. Paul did not mention the empty tomb, the visit by a woman or women, the stone, the angel/angels/man/men at the tomb, and reunion of Jesus with his followers in his resuscitated body. Rather, he believed that Jesus was taken up into heaven in a spirit body. It was only later, from about 70 to 110 CE when the four canonic Gospels were written, that the Christians believed that Jesus rose from the grave in his original body, and by his own power.”
http://www.religioustolerance.org/resur_lt.htm
All the scholars agree that Jesus in fact existed, so He was not a myth. What is attributed to Him in the NT is another matter because it was written by men who did not even know Jesus, so all the verses about how bad it's going to be for non-believers, false prophets and eternal torture were not necessarily anything Jesus ever said.
Maybe you are right, but you cannot know that the author knew it was not true, so that is just a personal opinion.
http://www.religioustolerance.org/resur_lt.htm