Ok i understand that in the NT the OT prophecies were fulfullied, but did God command them to have laws where if you do not follow the 10 commandments you get stoned or killed? And why woulnt God just allow them to have their sins forgiven in the beginning rather than having to redeem them?
It’s easier to think in terms of a Divine Pedagogy. Basically, of Israel as God’s first-born son, being slowly fathered through both the New and the Old. When one thinks in terms of Fatherhood, God is basically reaching out to a stubborn, prideful people who have been intellectually and spiritually darkened by the Fall. He is starting from scratch, as it were. This is in no way to state that there was not Grace prior to the cross, or that the Jews did not believe in Grace. However, both covenant rewards as well as covenant punishments in the Old Testament tended to be of an earthly, temporal nature. This would point to their spiritual realities in the New Covenant. This is a common theme of the spiritual life as understood by both Jews and Christians. The stages of the spiritual life were patterned in both the Tabernacle and the Temple, as one is progressively brought close to the Divine Presence. The earthly, animal sacrifices of the first stage led to interior spiritual truths of the second stage, where one finds the bread of the presence and a menorah.
Human death as punishments, as well as healing in the Old, often point to spiritual realities of death and sanctification in the New. Essentially, the entire arch of Old and New is of God bringing his child from darkness to light, as it was in the beginning before the Fall. Because of this, the Law can be seen as “starting small.” A process, if you will, of gradual spiritual instruction.
To answer your second question, one must realize that God is a personal being. It is no accident that marital imagery is most often used to describe His relationship with His people. If a woman cheated on her spouse, that rift is severe, and must be made right before a relationship can be resumed. In God’s case, the hurt and anguish is eternal, since He is eternal. It must be made right before He, as a perfectly just God, can wed Himself to us once again. He gives us the means, we only have to try, like a child jumping up for his father’s arms, and God will reach down and bring us the rest of the way. Such is the nature of Grace.
Jesus satisfies the requirements. Since His sacrifice was one of perfect love, the emotional aspect is satisfied in healing the gulf between man and God. The rift is healed, and God’s grace is overflowing.
And again, because the cross is predestined before the creation of the world, God can show such Grace and Mercy even in the Old, as a form of Divine Forbearance, because the cross has opened the floodgates across time. However, this does not change the fact that the Law as given in the Old will of a necessity be more primitive in form with Israel. One does not give lectures on advanced familial ethics to a spiritual toddler. Does this make sense?