people are weak to different things; maybe i can have one sip of alcohol and end up on skid row. maybe i can have a beer every night and it's never a problem.
thing is, you break the tiniest of God's laws, and you're a criminal on death row. so, any sin, fornication, lying, gluttony, sloth, being angry for no reason (prejudiced), hating someone (murder), calling someone made in God's image a fool; any of those will land you in hell.
whether you believe in hell prior to that experience or not.
the gospel, or good news, is that Jesus came to earth and paid the price for all of our sin; He was made into sin for us, and He gave His life to save us.
Our part is to thank Him, acknowledge Him as the Son of God, declare that He is Lord, and know that He is alive.
it's a small price to pay for a mansion in heaven, imho