First, historically, what is called Judaism today is not the same religion as the religion of the Old Testament. The most obvious example of a major difference is that the religion of the Old Testament was centered entirely around the worship of the temple and a complex sacrificial system as outlined in the Torah. Judaism today has no sacrifices and no Temple, and is completely reoriented.
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Historically, at the time of Christ, the religion of the Old Testament had blossomed into a vast number of different sects and groups. We encounter a few of them in the pages of the New Testament. Out of those various inheritors of the Old Testament/Israelite religious tradition, following the destruction of the Temple, and then Jerusalem, only two groups survived. One is Christianity. The other is Rabbinic Judaism. Rabbinic Judaism is the continuation of the religion of the Pharisee sect from the time of Christ. In the first and early second centuries, the chief debate was between these two groups, as to which one represented the true continuation of the Old Testament Faith. This is manifested in the pages of the New Testament, and in the early debates with the Quartodecimians. It even plays out in the issues of Old Testament canon, with Rabbinic Judaism forming the Masoretic text after several failed attempts to re-edit the Septuagint and de-Christianize its renderings. Therefore, it is incorrect to say that Christianity came from Judaism. Rather, Judaism and Christianity come out of a common root, the religion of the Old Testament.
That said, the clear testimony of Scripture and the Fathers is that Judaism is a completely invalid religion that is /not/ the Faith of the Old Testament. As Jesus says to the Pharisees:
"You do not know me or my Father. If you knew me, you would know my Father also." (John 8:19)
Therefore, Judaism's god is not God the Father, because if they knew Him, they would also know Christ. And again:
"If you were Abraham's children, then you would do the things Abraham did. As it is, you are determined to kill me, a man who has told you the truth that I heard from God. Abraham did not do such things. You are doing the things your own father does....You belong to your father, the Devil, and you want to carry out your father's desire. He was a muderer from the beginning, not holding to the truth, for there is no truth in him....The reason you do not hear is that you do not belong to God." (John 8:39-41, 44, 47)
Therefore, Judaism, because it does not share Abraham's Faith in Christ, is not 'descended from Abraham', and is not the Old Testament Faith, but Christianity is. Likewise, we have to look at Islam in this context. They cannot be worshipping God (the Father) because they do not know Christ. Likewise, their claim to Abraham's faith is equally as false as Judaism's. One can debate whether Judaism and Islam worship the same god, I suppose, but that god isn't the Father.
This is the clear teaching of Scripture and the Fathers, but in today's politically correct climate, no one wants to be accused of being intolerant or anti-Semitic for saying it. For references in the Fathers on this issue, I'd refer everyone to St. John Chrysostom's sermons against the Judaizers, and the excellent little volume of Melito of Sardis "On Pascha" put out by St. Vladimir's Seminary Press.
Taken from the writings of John Cassian at OCN.