You are meant to be able to use His Power, according to His laws, to create just like Him, which has absolutely no limitations of any kind. It means you can create, and manifest in form, anything whatsoever that you desire to. And it also means, eternal life.
But when you are cut off from God and going it alone, you are literally disconnected from power, from healing, from love, from joy, from trust, from abundance, from Life, from everything that God wants to share with you right now.
So what kind of a life do you expect to find yourself living, when you're living a lie? What kind of life will you experience when you refuse to allow it to be a life joined to and being lived WITH God?
It's going to pale in comparison, and it's going to be a life of weakness and suffering and death and fear and loss and disaster. You can try going it alone and doing it all yourself and keep shutting God out, but God is very patient and constantly offers His Gifts to you without conditions.
So this is kind of your choice. You either can keep living 'with' the ego which means being separate and having to manage your own life all alone and to experience unhappiness, suffering, and eventually death, OR you can choose to receive, accept, and share in God's mighty abundance, to illuminate your life from the inside out and to set you in a position of exquisite joy, peace and power.
The two lives really are nothing alike. And there's really nothing the ego can offer you that is ANYWHERE near what God can offer you. Okay so I sound a bit religious or recruiting here... but ok. You think the ego has given you amazing things in the world and you cherish and find important? Wait till you get in on the action with God!