I have had people tell me there is no proof of Jesus' resurrection. But Luke, in his two books, records many proofs.
In Acts 1, Jesus spent 40 days with them giving many proofs he was alive, meaning alive in the body and not just a spirit. Then the 11 saw him ascend into heaven. I never had 11 eyewitnesses at a trial as a prosecutor, but got convictions.
You can proclaim the resurrection. There is no evidence for the other theories, just speculation.
And while they were looking up in wonder as Jesus ascended to heaven, God thoughtfully sent an angel to remind them of the best part: he will return.