Question #1: Correct me if I'm wrong, but Jesus is considered a savior from Adam's sin. Does that mean everyone that was born before Jesus is going to hell?
I think "believing in Jesus" criteria only applies to people after Jesus' coming. God must have a different method for saving those before Jesus' coming. (I am talking about Gentiles, because Jews were saved by believing in the future coming of the Messaih, which is Jesus).
Perhaps those other people will be judged based on the natural law of right and wrong.
ROM 2:14 (Indeed, when Gentiles, who do not have the law, do by nature things required by the law, they are a law for themselves, even though they do not have the law,15 since they show that the requirements of the law are written on their hearts, their consciences also bearing witness, and their thoughts now accusing, now even defending them.)16 This will take place on the day when God will judge men's secrets through Jesus Christ, as my gospel declares.
OR perhaps Jesus preached to all of them:
1PE 3:18 For Christ died for sins once for all, the righteous for the unrighteous, to bring you to God. He was put to death in the body but made
alive by the Spirit,19 through whom also he went and preached to the spirits in prison 20 who disobeyed long ago when God waited patiently in the days of Noah while the ark was being built.
We are not sure. But we are not supposed to worry about that either. Our time is now. The time of everyone to believe in Jesus.
Question #2:Everyone that isn't Christian is going to hell. Isn't this unfair for someone who was born in a non-Christian home and was never taught about Christianity?
God can reach anybody He wants to. He will make sure they are called (hear the message).
ROM 8:30 And those he predestined,
he also called; those he called, he also justified; those he justified, he also glorified.
MAR 10:26 The disciples were even more amazed, and said to each other, "Who then can be saved?"
27 Jesus looked at them and said, "With man this is impossible, but not with God; all things are possible with God."
Question #3:God created the world in six days. Isn't it absurd that an all-powerful God has to rest on the seventh day?
I think God did it in order to promise something (like a rainbow is a promise of "no more flood"). I think seventh day rest is a promise of future salvation.
HEB 4:1 Therefore, since the promise of entering his rest still stands, let us be careful that none of you be found to have fallen short of it. -
I believe this is talking about salvation and getting saved - "entering his rest".
After death, we rest. We don't have to suffer or struggle anymore. REV 14:13 Then I heard a voice from heaven say, "Write: Blessed are the dead who die in the Lord from now on." "Yes," says the Spirit, "they will rest from their labor, for their deeds will follow them."