The essentials for me are that God made us and gets to make whatever rules he wants. Following those rules is righteousness, and not following them is sin.
He sent His son to be the perfect high priest who is able to make a perfect atoning sacrifice for us so that we can have a relationship with Our Father.
All it takes to get in is a sincere faith that we can have a high priest we can not see, and a love for others great enough that you would lay down your life for a person who just cut you off in traffic.
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