God is talking to Israel. Not the church.

(Isaiah 43:1-3 NIV)  But now, this is what the LORD says-- he who created you, O Jacob, he who formed you, O Israel: "Fear not, for I have redeemed you; I have summoned you by name; you are mine. {2} When you pass through the waters, I will be with you; and when you pass through the rivers, they will not sweep over you. When you walk through the fire, you will not be burned; the flames will not set you ablaze. {3} For I am the LORD, your God, the Holy One of Israel, your Savior; I give Egypt for your ransom, Cush and Seba in your stead.