As an atheist or skeptic dismissing Christianity as false is generally done through rationality and logic. We typically approach Christian belief by demanding proof their god exists. The evidence that Christians submit is usually the Bible and the argument that a creator must be responsible for the complex Universe we observe. Several years ago I had courses in comparative religions where I studied the alternatives to Christian belief. It is from this perspective I would like to discuss Christianity as a falsely interpreted religion derived from Judaism. I am an Ex-Christian atheist and do not accept Judaism as true any more than I do Christianity. I do not believe in invisible friends that look after the Universe.  It is not just the irrational belief in Christianity that led me from being a believer it was the illogical rejection of the original beliefs of the Jews. Judaism is the belief from which Christianity sprang and the differences are quite substantial. Christians appear to have falsely interpreted Jewish scripture that had an ancient basis. Jews that understand their religion do not convert to the derived religion of Christianity and reject Jesus as their Messiah. There is however a lot more to their rejection of Christian belief than Jesus not being as their described Messiah or Moshiach.

Judaism is actually a very liberal belief which is not the impression one gets from Evangelical Christians. As a Lutheran originally I was indoctrinated with Martin Luther's bigoted views of Jewish belief. It was later in life I found out exactly what Jewish belief entailed. The differences begin in the interpretation in Genesis and continue throughout the rest of scriptures. These problems are compounded by use of the poorly translated King James Version of the Bible by most Protestant Christians as well. In order to properly understand Jewish belief only the Hebrew Bible can be used. The version English speaking Jews use is the JPS 1917 Edition found here: http://www.mechon-mamre.org/e/et/et0.htm

Many evangelicals still use the poorly translated inferior King James Bible. It results in much of the hard core unassailable beliefs they profess. When I converted to Catholicism I began to use their version of the Bible and over the years I learned it was probably the most accurate version available today, that doesn't mean its real though. Bart Ehrman's book "Misquoting Jesus" details the issues involved in translations and interpretations.

When I must discuss the New Testament I generally use the Catholic version Douay-Rheims as a result of my research into the matter, found here:

http://www.drbo.org/

Jewish beliefs versus Christianity in General:

1)Man is born as a pure soul and can return to his creator the same. Christians say man is born with the Original Sin of Adam and must be saved from sin by the sacrifice of Jesus.

2)Judaism allows for evolution as the way God created the Universe. Many Christians believe God created everything as described in Genesis.

3)Jewish belief suggests the Garden of Eden story is a parable. Christians believe it was literal and actually happened.

4)The Messiah or Moshiach will come to establish God's Kingdom on Earth and he will be a man, not part of God. Christians believe Jesus the Son of God was the Messiah and came to sacrifice himself to placate God for man's Original Sin.

In order for Christianity to have basis from the founding religion of Judaism there must be errors the Jews made in interpreting God's will. As these beliefs go back to the origins or the Torah then the patriarchs must have incorrectly have understood God. Moses and those who wrote these books as well as the prophets must have incorrectly understood their relationship with Yahweh. This must be so in order to have Original Sin transferred to Adam's descendants instead of being born a pure soul. My challenge to Christian theists is where are these errors of understanding and why?