The point of the resurrection was to conquer death. Though it was a great catalyst for faith. It was not actually the point.
I wont repeat the well made arguments of getting stabbed in the lung and that finishing him if her were not dead already.
My statement will focus on the culture and the why the death was necessary.
The culture was Hebrew and Jesus was Hebrew, the initial church was Hebrew. Their beliefs were Hebrew and their traditions which were built around their beliefs were all Hebrew. Jesus didn’t toss out the beliefs, He came to fulfill them.
The Hebrews, also known as Jews, believed that both personal error and inherited error separated humans from their creator and that separation came in the form of death of body and death of soul. However, that the creator would send a redeemer to conquer death and restore their soul back to a relationship with their creator. They called this the messiah, and Jews still believe the messiah is coming, Christians believe he has come, Jesus.
Jesus is the Greek form of our name Joshua, both have the same meaning, He who saves. It is a common name, but it was instructed to be giving to Mary’s son versus giving to her son because she thought the name was cool.
The curses of sin (or simply error or mistakes,) based on the Leviticus law are “passed” father to child, so by not having an earthly father, there would be not inherent sin. Then by living a life perfect of sin he would be capable of being the perfect “payment” of sin. but because he is god and the creator of life, he would not and could not be controlled by death or held in captivity of death. He must completely die, in order to be the payment of sin. He must completely conquer death to restore himself and all of us back to life. Not that our bodies will not die but that our souls can live for ever. This was his aim, not just a great religion, but a complete restoration of his people not just the Jews because not just the Jews are effected by death but of all people.
Every culture since the beginning of time, whether they believe in the Judao-Christian God or not, Knows that our souls were built for immortality, and that something must be done to restore them to that immortality.
This was/is the solution. A perfect payment for all the errors of our humanity, and a complete overcoming of the ultimate captivity.