This is the part of the Christian ideology that I hate the most. Since it's impossible to not sin, you're going to hell unless you believe in Jesus. Even back when I was Christian, this just seemed so evil to me. I actually remember asking about this in church and was told that it's why Christians have missionaries, to save the souls of those who don't know of God'slove, or something like that. It was less than a satisfactory answer because not everyone in the world could hear of God.
This is also the reason I could never be Christian, even if there was definate and irrefutable proof of God. I wouldn't sell out my own personal morals and worship a diety who eternally tortures innocent people for not believing in him, despite having no reason to do so. [/rant]