They answered him, "Abraham is our father." Jesus said to them, "If you were Abraham's children, you would be doing the works Abraham did, John 8:39 ESV https://bible.com/bible/59/jhn.8.39.ESV Lots of people claim to be Abrahamic. Yet the true children of Abraham are not necessarily biological, whether by Isaac or Ishmael, but the ones who follow in Abraham's footsteps. A biological child who goes against their biological father is no true child at all. So what were the works that Abraham did? He believed God, and it was credited to him as righteousness. Belief might not seem like much work, but Jesus Himself said that the work of God is to believe in the One He has sent- even Himself. So how is belief work? Abraham's belief in God caused him to leave his homeland and enter the promised land. He trusted God for Isaac (notwithstanding his Ishmaelite blip!). Abraham was even prepared to give up Isaac for God. We should be prepared to give up whatever is most precious to us for God. Thankfully, God gave up His precious Son for us, so that we can be reconciled to Him by faith. 'Father God, please help us to walk in Abraham's footsteps and to trust in You alone for our salvation. May we be prepared to give up what is precious to us for You who has given us Your beloved Son. In His name, amen'