"(For they could not endure that which was commanded, And if so much as a beast touch the mountain, it shall be stoned, or thrust through with a dart:" (Hebrews 12:20 KJV)
"Obviously, the law applies to those to whom is was given, for its purpose is to keep people from having excuses, and to show that the entire world is guilty before God. For no one can be made right with God by doing what the law commands. The law simply shows us how sinful we are." (Romans 3:19-20 NLT)
It is pretty strange that some people can't actually believe that God has made this His plan all alone; some of the most misunderstood reasons that some believer's quit believing, is because they cannot except God allowed something to happen; which ends up causing them to give up.
This world has been in a fallen state ever since Adam ate of that forbidden fruit; and this was not God's fault! He knew that it would happen, only because He knows all things! There is nothing that He does that is a mistake or a something that He regrets doing; even though some might think He regrets making man! Genesis 6:6 gives many people that idea; but God's love for us is greater than we could ever understand; it broke His heart to do what He had to do, when He flooded the earth...
""How are these things possible?" Nicodemus asked. Jesus replied, "You are a respected Jewish teacher, and yet you don't understand these things? I assure you, we tell you what we know and have seen, and yet you won't believe our testimony. But if you don't believe me when I tell you about earthly things, how can you possibly believe if I tell you about heavenly things? No one has ever gone heaven and returned. But the Son of Man has come down from heaven. And as Moses lifted up the bronze snake on a pole in the wilderness, so the Son of Man must be lifted up, so that everyone who believes in him will have eternal life." (John 3:9-15 NLT)