That's Paulian/Roman nonsense. Jesus preached duty and righteousness and you will taste Hell as one should if you don't do as Jesus did, within your personal limitations ofc. You're supposed to believe and behave like Jesus (he doesn't even use himself as an example because he understands only God is truly good, he says we have to be "perfect like the Father", a monotheist maxim), not "in Jesus" like he's Zeus or something.