what if jesus did not die on the cross?, page-86

"only through Jesus can you enter the kingdom of heaven....there is no other way!"

There are plenty of other ways. Jesus said os.:

The kingdom of heaven belongs to the poor in spirit.

Blessed are they who are persecuted for righteousness' sake, for their's is the kingdom of Heaven

Plenty more in the Sermon on the Mount about rewards from God, without believing, to say nothing of Mt 5:17-20, where Jesus makes it crystal clear that, until heaven and earth pass, the only way into heaven is to exceed the righteousness of the Pharisees.