If it is true that...

Jesus Christ was buried in an above-ground tomb

Then it must be true that...

Jesus Christ's body could have been reproduced

If it is true that...

The Pharisees sought to debunk the claims of the alleged Christian witnesses

and

Jesus Christ's body could have been reproduced

and

The Pharisees did not reproduce the body of Jesus Christ

Then it must be true that...

The post-mortem sightings of Jesus Christ could not have been the product of hallucination