Salvation is not something that has already happened. It’s something happening now. But because so many people see “getting saved” as something that happens instantly, they think of it in the past tense; as if everything has already been done. So when they read Ephesians 2 it seems natural that all that Paul is describing has already happened to us.
However, in the first ten verses of Ephesians chapter two Paul is saying something very important to us. But it has been obscured for three reasons. Read Saved or Being Saved to find out how.