All the following facts are taken from this excellent BBC documentary which investigates the stories surroundiung the New testament account of the crucifixion, death, resurrection and ascension of Jesus, by interviewing historians, theologians and historical researchers.
Death from crucifixion could take 3 days. According to the conflicting stories in the gospels, Jesus was only on the cross either 6 hours or at most 9 hours.
In the gospels, Pontius Pilate finds it difficult to believe that Jesus could have died so quickly and has to be reassured by a centurion (the same one who earlier proclaimed Jesus as the son of God) that Jesus is really dead.
You don't have to believe in a conspiracy theory or that the gospel is lying to think that Jesus didn't die on the cross, it was possible it was a mistake by the disciples. They might have thought it was a miraculous resurrection, Jesus could have gone into a coma through shock and been revived in the tomb. There are records of plenty of people who did survive 1st century crucifixion. The resurrection is explicable. But what about the ascension?
The ascension is not mentioned in any of the original gospels. It was in the last 16 verses of Mark which were added some 300 years later. And it is inserted as a sentence into some versions of Luke because Luke was assumed to have written the Acts of the Apostles which talk of the ascension. That is the lie, the cover story to get Jesus out of the country. It would have been dangerous for Jesus to remain in the Roman Empire, and there are stories of him fleeing the Roman Empire to the East, to India.
There are a number of stories that Jesus went to India, one tells of his time there during the missing years from the ages of 12 to 29. We know at least one of the disciples - Thomas, went to India so it would not have been unusual for Jesus to also have visited.
Buddha pre-dates Jesus by 500 years, so if Jesus did go to India he would have been exposed to Buddhist teachings, which bear a remarkable similarity to Jesus's miracles and teachings. After his crucifixion Jesus returns to India and carries on his ministry in Kashmir. The stories bear this out with the legend of the 'prophet from Israel' who arrives in Kashmir around 30AD and dies there in 80AD. Shortly before his death this prophet - Jus Asaf (leader of the healed) claims to be Jesus Christ. His shrine can be found there and he is buried in the Jewish tradition (facing East-West) and his shrine contains a carving of his feet which bear the scars of crucifixion.
Most academic theologians and intelligent churchmen, or a very significant number of them, do not believe that the resurrection is the literal truth. To them it's a metaphor to tell us that there is hope.