God spoke to them directly, on Mount Sinai. This was in the presence of millions of witnesses.
Jews believe in God the creator and in the Torah which God gave.
We believe that Moses received the Torah from the top of Mt. Sinai.
He brought them out of Egyptian slavery and gave the Torah to them (the Jews).
That the Torah is to be obeyed and is the word of God.
God, the Torah, and the Prophets
Many Traditional Jews believe the Torah was given to Moses directly from God. Others believe God dictated it to Moses. Many non-Orthodox Jews believe the Torah was inspired by God, but written by Moses and/or other annonymous writers. And there are many other views as well, including those Jews who believe the Torah was completely man-made with no divine element at all.
One God, creator of all things, who gave the Torah.
God wants us to keep the Torah.
God gave the Torah to Moses on Mt. Sinai
god
"Progressive" implies change. Orthodox Jews are those who believe in God and the Torah, and keep the commands of the Torah (Sabbath, Kashruth, etc.).
Torah-Jews consider it illogical, immoral and abhorrent to think that a Hitler, for example, could escape God and punishment by swallowing a poison.