According to Galatians, Paul contrasts the spiritual children of Sarah with those of

Rachel

False

Explanation:

It is FALSE that According to Galatians, Paul contrasts the spiritual children of Sarah with those of Rachel.

This is because Galatians 4:21-31 talks about the Allegory of Hagar and Sarah in which he explained and contrast their spiritual children, but not Rachel and Sarah.

This is evident in part of the Bible verse above "Tell me, you who desire to be subject to the law, will you not listen to the law? For it is written that Abraham had two sons, one by a slave woman and the other by a free woman. One, the child of the slave, was born according to the flesh; the other, the child of the free woman, was born through the promise. Now this is an allegory: these women are two covenants. One woman, in fact, is Hagar, from Mount Sinai, bearing children for slavery. Now Hagar is Mount Sinai in Arabia* and corresponds to the present Jerusalem, for she is in slavery with her children. But the other woman corresponds to the Jerusalem above; she is free, and she is our mother..."