Do you think God would give us a law which is impossible to keep?
I'm not answering for Reba (I'm not wise enough), but if God's Old Testament laws were possible to keep, then Jesus Christ died for nothing.
Christ died because Israel did not understand that God wants mercy not sacrifice and they were trying to keep the letter of the law to merit salvation - that is what is impossible to do. but Jesus and Paul taught us that love fulfills all the law (the spirit of the law).
Christ died because it was God's plan His plan from the foundation of the world. Man does not set God's plan God does.
It was God's plan because He foreknew that the Israelites would not understand the true intent of the law.
Michael then how come He died for them, you and me?
Rev 17:8
8 The beast that thou sawest was, and is not; and shall ascend out of the bottomless pit, and go into perdition: and they that dwell on the earth shall wonder,
whose names were not written in the book of life from the foundation of the world, when they behold the beast that was, and is not, and yet is.
KJV
When were the names written in the Book of Life?