I guess at this point, its time for me to step in to clarify some things:
1) It is one of the biggest misconceptions of all time to believe christians are called to convert the masses. They are called to inform the masses. Beyond that, only God can convert a heart; a christian's call is only to make sure people aren't mistaken in their perceptions of christianity, and have their facts right. If they do, and still don't believe, then Jesus said it best when sending his apostles to preach for the first time (paraphrasing here): "Shake the dust from your feet, and move on."
2) Yes, in christianity, all non-believers end up in the Lake of Fire. Ironically, that also goes for some people who call themselves believers, but participate in christianity for alterior motives (power, influence, etc). There is a reason Jesus tells the parable of some people locked out of heaven, standing at the gate shouting "let us in! We know you and you taught in our streets!" and him replying "I tell you the truth, I do not know you - go away you wicked people!" To view it like "join or die" is indeed backwards from the christian perspective. Its more like everyone is on a burning catwalk, and there are ropes to the side everyone can jump to and reach safely. Some have jumped, and caught the rope, and others are too scared to try, be it personal fear, jaded cynicism that there aren't really enough ropes for everyone, or thinking the rope will break when they jump for it, or they will miss.
In other words, from the christian perspective, everyone starts off going to hell. Equal footing. From there, there are those who jump for that safety rope, and others who don't for their own reasons.
You might not like that perspective, but that is what the christian perspective is - everyone deserves to go to hell, christians and non alike, but only by grabbing that safety rope can you save yourself from that. There was even a nice man named Jesus who jumped onto the burning catwalk while still holding onto the rope, and offered for anyone who's scared to just climb across his back to get to the rope, to make things easier.
The thing is, while he's tied to the rope and going to be ok, that catwalk is only going to last so long before it falls and Jesus is forced to let go. But it's not because He didn't try.
*Joren, Legend, Alleged Egomaniac, Thread-Killer, 3-time Ban Recipient, and 6th Grade Spelling Champ*