Continuing my dialog with a Muslim man in the UK. See part 1 here and part 2 here.
5) Why do you believe in a book that has been changed many many times and has so many contradictions,absurdities, and scientific errors.
Changed? Contradictions? Absurdities? Scientific errors? You must be talking about the Qur'an. But before I go there, I will address your question.
Changed many times? Again you did not define what you mean, so I must make an assumption of what you mean. I assume you mean the standard line given by most Muslims, that we have many "versions" of the Bible. After all, you are want to quote Ahmed Deedat and this was his line of argumentation. So I assume it to be yours as well. "Christians have the King James Version, the American Standard Version, the New King James Version, the New American Standard Version, the Revised Standard Version," ad nauseum....
These are not 'changes' to the Bible but simply new translations to bring the understanding of the text into modern usage. The common meaning and definition of words changes over time in any language - Arabic as well, which is why many of the brightest Islamic scholars do not understand the meaning of literally hundreds of words in the Qur'an because the classical Arabic of the Qur'an is a lost language. But I digress. For example, 80 years ago in American colloquialism, the word 'faggot' meant the butt end of a cigarette. Today the word is a pejorative term for a homosexual. Nobody today speaks the "Kings English" of the time of King James, using words like 'thee' and 'thou' and 'thine.'