One seed

Now to Abraham and his Seed were the promises made. He does not say, “And to seeds,” as of many, but as of one, “And to your Seed,” who is Christ. – Galatians 3.16

When God spoke to Abraham about what He would do he spoke of things like ‘in you shall all the nations of the world be blessed’ and 'your descendants will be like the sands on the sea shore and as the stars in the sky.’ As time went by Israel began to think that that promise referred to the nation of Israel alone.

The one seed though refers to all those who are Abraham’s spiritual seed. His physical seed are indeed Israel. Of that there is no doubt, but it is spiritual seed that really matters for eternity.

Abraham did not know the full extent of what he did when he believed God, but he setting that pattern of salvation for all time. God doesn’t have a whole variety of descendants. We has produced one line and it is only those who have believed God like Abraham did.