It can be summed up in this quote by Rabbi Hillel:
What is hateful to you, do not do to another. The rest is detail. Now go study.
The single main teaching of Judaism is that God is One (Deuteronomy 6:4). Other than that, Judaism has many teachings, but none are on the same level of importance.Jews consider all of Judaism's classic texts to have some degree of holiness, but the greatest (and most holy) of these is the Hebrew Bible, which we (in Hebrew) call the Tanakh.
We don't a 'teaching priest' in Judaism.
Dwight Delahunt has written: 'Judaism' -- subject(s): Study and teaching (Secondary), Judaism
that there is only one g-d. God is not an idol.
The main teaching of Islam is to worship Allah (or God in English and same God worshiped in Christianity anf Judaism) as the one and only one God with no son, no father, no companion, no partner, no associate, and no equivalence. Refer to related questions below.
the main teaching prophet was to preach islam
Reformed Judaism believes that the Bible is the main source for the rules of Judaism.
Israel.
Moses.
JUdaism
The Torah.
Catholic believe and follow the works of Jesus, but Judaism did not agree of it because they await the messiah to come.Most of their teaching based from the law of Moses.