If it is true that...

There are mentions of Christ in non-Christian writings

Then it must be true that...

The historical existence of Jesus is quite certain

If it is true that...

Contemporary Jewish sources derided Jesus and called him a lunatic

and

If Jesus existed, one would expect contemporary Jewish sources to deride Him and call Him a lunatic

Then it must be true that...

The historical existence of Jesus is quite certain

If it is true that...

We lack any contemporary anti-Christian sources that claim that Jesus never existed

and

It would have been a great argument for contemporary anti-Christians to claim that Jesus never existed

and

There existed many contemporary anti-Christians

Then it must be true that...

The historical existence of Jesus is quite certain

If it is true that...

The historical existence of Jesus is quite certain

and

It is surprising to have certainty of any Judean's existence around Jesus's time

Then it must be true that...

There is something interesting about Jesus