Mainly because I do not believe anyone can come back from the dead, and the reports are very old.
If one accepts the existence of an omnipotent God, the author of the universe and its natural laws, cannot God operate independently of those laws and work a miracle to regenerate a dead human body?
As for the age of the reports, it is more significant that the reports were made by eyewitnesses very close to the time of the purported event. Biblical scholars have dated early creeds and sermon summaries found in 1Corinthians and Acts to within a few years after Jesus' crucifixion. Incidentally, this also administers a slam dunk against Dan Brown's claim in The Da Vinci Code that the divinity of Jesus was only established at the Council of Nicea by Emperor Constatntine centuries later. Jesus' divinity was taught by the apostles from the very beginning.
It is interesting to note that the first counter theory raised by skeptics was that someone had removed Jesus' body from the tomb.
stuartcr, I enjoy talking about these things and I hope you don't think I'm just an argumentative *#)#!