If they were going to lie about the Resurrection they would have done a better job of it. Just for starters, all four gospels name women as the first people Jesus appeared to. Any first century Jewish man cooking up a lie would not have done that. In first century Jerusalem, women were not acceptable witnesses. Their word was not taken. So, if anyone was lying about the Resurrection, they would have placed men at the tomb, not women.
Second, nothing but the Resurrection can account for the radically changed life of the apostles. Prior to the Resurrection, they were hiding in fear. John was the only disciple to stand at the foot of the Cross, as I’m sure you all know. Yet after the Resurrection, all of the apostles became very active. All were eventually martyred except for John, and he was thrown in a vat of boiling oil, though it doesn’t seem to have harmed him.
I could go on and on and on, but I’m sure most of you know all of this. Liars would have done a better job of it.