But I know lots of people who don't trust Jesus, don't believe He ever existed, or believe in some other god to save them.
What happens to them?
What do Calvinists and Arminians have to do with this? Well, I was having a conversation with a young woman the other day, discussing the implication and reality of hell, when we came to an impasse. She was a firm arminian, which means she believes that it's man choice to be saved, and God does not interact in the process in any way. She had an objection to crying out to God in prayer for the sake of the individual who doesn't know Jesus. She didn't believe that God would do anything to the person, so that the choice was totally theirs. I replied that our job should then be to plead the unsaved individual to turn to Jesus, but she expressed doubt that it would work. Essentially, she backed herself into a corner. She couldn't cry out to God to save the person, because God would not act. At the same time, the person would not turn to Jesus just because of her words, because they hadn't in her experience.
I have had a similar experience with some Calvinists in the past. For these Calvinists, the basis of their belief was that God would ultimately just save people, and that salvation was a work of God alone. That meant that any attempts to share the gospel with someone was utterly pointless, because no matter what they said, God alone saves. With that line of reasoning, making disciples lost any value, because God was the one who saved people, and if God wanted to save people, He would.
"I don't have the time," "They wouldn't listen to me," "If God wants to save them, He will," or my favorite "someone else will." Excuses do not negate the irrationality of the two beliefs being together. My problem is using excuses in order to avoid the inconsistency in belief and actions. Now, I love both my Arminian friend, and my Calvinist friends. I hope I'm not trying to point out specks in other people’s eyes, without pointing out planks in my own, but Christians cannot hide behind excuses. Either they believe that people without Jesus are going to hell, or don't. If it's the former, then act, if the latter, don't. At the very least, in my life, I will make the commitment to live consistently with the reality of hell, and work to somehow share Jesus every chance I get. I may not do it right, or well, but the very least I can do is try.