hello,
i have a question to the jews..
Must jews or noachides believe that the Thorah is written by Moses?
Is this a fundamental principle of faith of Judaism?
The predominate view in Orthodox Judaism is that the Torah was given by God to Moses on Mount Sinai; most Orthodox Jews, in my experience, would say that means that the Written Torah which we have today was passed down, verbatim, from Moses, who heard it from God at Sinai.
That is not the predominate view in non-Orthodox Judaism. There are many different views in non-Orthodox Judaism concerning Torah authorship.
The 13 Principles of Faith written by Maimonides were his
opinion about what are the indisputable fundamental principles of Judaism. They are not canon or doctrine. Many have disagreed with him, and there is nothing wrong with that. There are actually quite few universally accepted principles of Jewish faith: Judaism is a religion that makes room for many differing opinions on more or less every matter.