Tell me something, isn't that what God told Adam, that eternal life depended on him obeying Him? He said "eat of the fruit and you will die". If Adam had not sinned, the world would be filled with humanity, under the same conditions as Adam, obeying God's command. It was the same as the Law Covenant with the nation of Israel. God's plan for humanity has not changed. They will still need to obey God and his commands.
comes the natural, and then comes the Spiritual. He was in need of a Spiritual birth the same way we are.
The same as Adam, obeying God??? Wow. Adam disobeyed God! Which, btw, is natural for a natural man to do.
You seem to think that man can perfectly keep God's commands. We would not need Jesus if that were so.