Even when we were dead in our trespasses, he made us alive together with Christ. By grace you have been saved. Paul describes the most radical identity change: from dead to alive. Not from bad to better. From dead to alive.
Your new identity is not an improved version of the old. It is completely new life. Made alive with Christ. This was not your merit but pure grace.
Today: you were dead, now you are alive. This is not a detail. This is everything.