kachana, I haven't been here in a couple of days, but I honestly understand where you are coming from with your question. We (Christians), do preach that without Christ, you will spend an eternity in hell, and that you are even deserving of it because of your sin!
Allow me to show you where I am coming from, and where the Bible is coming from. You see, the Bible teaches that all men have sinned and have come short of the glory of God. (Romans 3:23) That would include every man that has ever lived! The Bible also teaches us that the punishment for sin is eternal death and separation from a Holy God. (Romans 6:23)
The Bible doesn't stop there, though. God provided a way to redeem man from his sin, by sending His Son, Jesus Christ to die in our place, and to rise again, thus finishing the transaction- paying it in full. All he asks of man is that we believe on the Lord Jesus Christ and repent of our sins before God.
I did this as a child, and every where I go, and the people I meet, I want to tell them of this! My motive for preaching the Gospel of Jesus Christ is to offer them the salvation that I received freely of Christ. It is not my desire that anyone, any atheist die in their sins and pay eternally for them, when Christ did it for them if they would only believe!
I was once a sinner and on my way to hell as well. That is why I converse in earnest with those who will listen to the Gospel. I would like nothing better than to bring someone to the saving knowledge of Jesus Christ.
Think of it as someone yelling,
"Stop! Don't go that way, you will die! Now, here is the way to life!" 