What Jerusalem are Grace Age believers tied to?

Grace Age believers are tied to the heavenly Jerusalem which is above, not the earthly Jerusalem or its temple worship. Their citizenship is in heaven, and this heavenly Jerusalem is free, with total liberty, and is the mother of us all.

Les explains that at the time Galatians was written, the temple in Jerusalem was still fully operating with sacrifices, priests, and daily ritual. But since Paul received his revelations, believers have total freedom of grace. Philippians 3:20 speaks of our conversation, or citizenship, which is in heaven. When we were translated into the kingdom of His dear Son, we became citizens of it. So Grace Age believers are not tied to temple worship in earthly Jerusalem; they are tied to the heavenly Jerusalem above, which is free with total liberty and is the mother, or beginning, of us all.

Galatians 4:26

But Jerusalem which is above is free, which is the mother of us all.

Who is the Jerusalem above that Paul calls the mother of us all in Galatians 4:26?

The Jerusalem above, described as heavenly and free, is Sarah, the free woman. She is the mother of us all because she had the child by promise. She stands in contrast to the Law given to Moses at Sinai, which is bound to Hagar and fleshly bondage.