heavenly one

"heavenly country" or "country in heaven"

God is not ashamed to be called their God

This can be expressed in active and positive form. Alternate translation: "God is happy to have them call him their God" or "God is proud to have them say that he is their God" (See: rc://en/ta/man/jit/figs-activepassive and rc://en/ta/man/jit/figs-litotes)