God came to Earth and showed us how to live. The penalty for sin is death. We could not pay and still be with Him. Therefore He, who is sinless, became sin and paid our debt. Then He rose from the dead to give us eternal life.
Don't believe me. Ask Him when you're before His throne. Or read His book.
Good, concise summary.
G-d already told us how to live. All you need to do is read G-d’s law.
Are you stating G-d was wrong?
The law showed us how to live. God, in the person of Jesus Christ, saved all how call upon his name from the penalty of the law.
Amen and take heed any who doubt.