You were once dead because of your failures and sins.
You followed the ways of this present world and its spiritual ruler. This ruler continues to work in people who refuse to obey God.
All of us once lived among these people, and followed the desires of our corrupt nature. We did what our corrupt desires and thoughts wanted us to do. So, because of our nature, we deserved God's anger just like everyone else.
But God is rich in mercy because of his great love for us.
We were dead because of our failures, but he made us alive together with Christ. (It is God's kindness that saved you.)
God has brought us back to life together with Christ Jesus and has given us a position in heaven with him.
He did this through Christ Jesus out of his generosity to us in order to show his extremely rich kindness in the world to come.