Many use the phrase “the Abrahamic religions” to describe Judaism, Islam, and Christianity. But what does this mean? Do we mean that each religion is a legitimate descendant of the faith Abraham shared or that these three religions merely claim it? If we care about truth, we must accept the second definition, because the three expressions radically contradict. Therefore they cannot all express Abraham’s faith. So what was the faith of Abraham? We must look to Genesis (the earliest account of Abraham’s life) and compare it to Jesus’ own teachings as passed on through his apostles. Doing so, the Christian faith is found to follow Abraham’s faith.
And [God] brought [Abraham] outside and said, “Look toward heaven, and number the stars, if you are able to number them.” Then he said to him, “So shall your offspring be.” And he believed the LORD, and he counted it to him as righteousness. (Genesis 15:5-6 ESV)
For the promise to Abraham and his offspring that he would be heir of the world did not come through the law but through the righteousness of faith. For if it is the adherents of the law who are to be the heirs, faith is null and the promise is void . . . That is why it depends on faith, in order that the promise may rest on grace and be guaranteed to all his offspring—not only to the adherent of the law but also to the one who shares the faith of Abraham, who is the father of us all, as it is written, “I have made you the father of many nations”—in the presence of the God in whom he believed, who gives life to the dead and calls into existence the things that do not exist. In hope he believed against hope, that he should become the father of many nations, as he had been told, “So shall your offspring be.” . . . No unbelief made him waver concerning the promise of God, but he grew strong in his faith as he gave glory to God, fully convinced that God was able to do what he had promised. That is why his faith was “counted to him as righteousness.” But the words “it was counted to him” were not written for his sake alone, but for ours also. It will be counted to us who believe in him who raised from the dead Jesus our Lord, who was delivered up for our trespasses and raised for our justification.
Know then that it is those of faith who are the sons of Abraham. And the Scripture, foreseeing that God would justify the Gentiles by faith, preached the gospel beforehand to Abraham, saying, “In you shall all the nations be blessed.” So then, those who are of faith are blessed along with Abraham, the man of faith. (Galatians 3:7-9)
For more, read Galatians and Romans 4-5, and of course the rest of Genesis. Discover that Abraham’s saving faith was a faith in God’s grace and promises rather than an obedience to laws. We must conclude that the only truly Abrahamic faith is one that trusts that God saves by faith in his promises and good news.
Image credit: Daniel Eisenstein and SDSS-III (http://www.eurekalert.org/multimedia/pub/119797.php)