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Why is a savior even needed then?
And how did the whole world get caught up into something that was only meant for a people during a specific time period?
God preserved a bloodline from Adam to Abraham (Jews) to Jesus with the intention of reaching the rest of humanity.
Isaiah 49:6 NASB
He says, "It is too small a thing that You should be My Servant To raise up the tribes of Jacob and to restore the preserved ones of Israel; I will also make You a light of the nations So that My salvation may reach to the end of the earth."
When Adam and Eve chose to sin it defiled them and their progeny, separating them from God. They gave away their life and their dominion of the earth to satan, identifying with his nature instead of God's. God is holy and pure, which means that He would have to destroy them if they remained in His presence in their sinful state. He separated Himself from them to avoid bringing judgment against their sin. From there they had lots of children who produced more children, and so on.
The Lord would reach out to people to show them the way back to having a relationship with Him again, but the people wouldn't stop doing evil. But there was a man named Abraham who wanted to know God and live righteously. The culture in Abraham's day was full of people worshiping demons and idols, offering their kids as sacrifices to them, there was rampant prostitution, homosexuality, theft, and murder. Abraham didn't want any of that. He wanted to live righteously, so the Lord approached him . He had faith in God and followed His leading, so God made a nation out of him and his family. God had always planned to reach the rest of the world through the Jewish people. He gave the Jews the Law of Moses as a guide for differentiating between right and wrong, and how to live a life that would be acceptable to God. But people couldn't live up to the strict standards of holiness that was presented in the Law.
God is what is referred to as the Trinity, meaning He is three persons while being one God simultaneously. The second person of the Trinity stepped down from His kingdom temporarily and took on a human form (100% human while still 100% God). He is Jesus Christ. He grew up and followed the Law of Moses without breaking any of its laws and never committing a sin. He kept God's strict standard of holiness.
During Old Testament times the people would offer animal sacrifices to God as a sign of devotion to Him and for repentance of their sins. The killing and bloodshed of the animal represented a covenant between God and man and acted as God's promise that He wouldn't hold their sin against them so long as they stayed devoted and reverent to Him. The animal sacrifice would represent the sins of the people, which when killed, would cover up the sins of the people. These sacrifices were only an outward sign of what God would do through Jesus by placing all of humanities sins on Him and sending Him to die on a cross. To the Jewish people, anyone hung from a tree was considered cursed. This means that Jesus took man's sin and curse on himself and took them away when He died. Jesus was resurrected by the Holy Spirit (the third person of the Trinity) three days after His death into an immortal form (still 100% God and 100% man). He's our connection to the Father (first person of the Trinity) and our only way to be saved from hell.