Hallie, in my opinion, letters of membership don't really count. It's what you carry in your heart. God can't be limited by man made objects such as letters and stuff like that.
You could be held prisoner somewhere and God would still love you and take care of you. It's a fact!
If you ever decide to become a member of a church, they will make their own letter of membership or move yours to their church. I don't even know where I'm a member! LOL But I know I'm a child of the King! THAT'S what matters!
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.