Honestly, I don’t really know. But I think it’s that some people don’t want to be with God. So they aren’t let into heaven because they don’t even want to be there with God.

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which is basically 1

Yes, but with a picture, you can't see all sides of the skin. Also, am I allowed in?

Actually, everyone, even Christians, are worthy of hell because we were all born sinners, and the wages of sin is death and separation from God. But it's by God's grace that we are able to go to heaven. God extends his grace out to everyone, but it's only those who willingly accept his grace that get to go to heaven. So people who don't believe in God will defiantly go to hell.

Yes they do. To get into heaven, you just need to trust that Jesus is Lord and that he gave up his life to save ours.