Say "whatever" and walk away. You are not required to be the Jackass Whisperer.

Threaten them with dragons.

I tell them it's o.k. with me as I will know more people there.

Just remember, they believe in an invisible man in the sky. Then move on knowing that person just threatened you with a fairytale.

Tell them that hell is only for those who actually believe in hell. But really it's only a lie pushed by those wishing to control you.

I tell them maybe they should practice forgiveness and love instead like that Jesus guy talked about.

I would respond that the only hell that exists is the senseless pain experienced on earth by cruel and thoughtless people -- and often by highly judgmental ultra-religious people.

Tell them (sarcastically) they are doing an excellent job of displaying the loving demeanor that Christ demanded of his followers, and thank them for being walking examples of the hypocrisy he preached against.

Ask them why they're not afraid of going to the hell of a different god than theirs.

Well you could say you don't belive in the tooth fairy,Santa Claus or the Easter Bunny either,its about the same level. Or how about quoting some of their own scrpiture right back at them as in who gave them the rioght to judge what deserves to go tp hell for...

"When they kept on questioning him, he straightened up and said to them, "Let any one of you who is without sin be the first to throw a stone at her."
John 8.7

And

"Do not judge, or you too will be judged."

Matthew 7.1

Tell them that you find it incredibly sad that they believe in such a cruel god.

I like to say, ‘If I am wrong, and I meet your god at Heaven’s gate, I will joyously announce my failure at disbelief and ask to be forgiven.’

Tell them you'll save a seat for them and walk away laughing.

Most of the religious people I have met have been a bunch of sneaky, two-faced, conniving, back-stabbers who are all going to heaven. I don't want to meet any of them again, so I think that going to hell would be a pleasure, at least I will be able to ride around on a Harley !!

Reply with... I'll see you there!

The last time I was told I would go to hell I told them that they would suffer forever in Tarturus for forsaking Zues and the Olympians

"Hell? Hell, Michigan? I passed through there once...kinda wish I hadn't"

Thank the person. All the fun people will be there

Take your two index fingers and place them on the top of your forehead in the manner of horns, stick your tongue out like Gene Simmons from Kiss and make demonic hissing sounds like a demonicly possessed cat.

In the past, I've responded with " I don't believe heaven or hell exists - but if you do, well, pick one and have at it !"

The end.

You might want to point out that he'll was a 2nd century construct that was invented for the purpose of promoting political control and has nothing to do with the teachings of Jesus (I assume the people threatening you with he'll are Christian).

say something like, "I would rather burn in hell the worship an entity that would subject billions of people to eternal torture for not worshipping them, if your religion is real, i will be a soldier on the front line of hells army in the fight for freedom. "

Tell them hell isn't real and only nothingness awaits us.

Tell the person, "I'll save you a seat..."

It depends what the situation is. You can just say "that's cool" "see you there" or just "ok" anyways, just keep in mind that you feel sorry for these people's misplaced belief in their religion/ god.