"Jesus replied, 'Very truly I tell you, no one can see the kingdom of God unless they are born again,'" (John 3:3).
There is just no other way to the fulfilling peace of God's kingdom, to the Heaven we are all internally designed to desire and hope in. You must be born again, made spiritually new by the redemptive power of Christ. There is no other way, because there is no other paradise. There is no Heaven without God, and there is no entrance without salvation.