I think you have to trust him. It sounds to me like he is saying he can’t be that for the child. Have you asked him if he will still be in the child’s life in any way? I can only say don’t judge his decision. I know you are hurt by it, but try to accept what he can give, ie maybe just being an uncle. You never know what people are going through so try give him the benefit of the doubt, sometimes the beginning of a vocation is a great challenge, spiritually and physically (often one does not want to share this), try be sensitive to this and love him anyway even if his decision is painful for you. I doubt he is trying to hurt you or this child. I am sure he can ‘hand down the faith’ in other ways when he is able. Being a godparent is not the only way to be a good Catholic family or to interact with the child in a spiritual way. God bless you all