Re: Who do you choose to be God parent?
Well, our kids are baptized Roman Catholic and I am not sure if the Lutheran faith is the same, but when we baptized the two younger ones, not quite two years ago, we were told that our children's Godparents didn't need to be Catholic. Maybe check into whether or not that's a requirement for your church. If not, then perhaps you could select family members that you trust that are currently Catholic but maybe not practicing or not all that devout in the Catholic faith.
My youngest's Godmother is non denominational Christian.