The year 70 CE was the year the ancient Temple was destroyed in Jerusalem, beginning the exile of the Jews by the Roman Empire. (Jews do not use the term A.D.)
This marks the point when the religion changed into a prayer and study based religion, instead of a sacrifice based religion.
When we received the Torah.
The exodus from Egypt is the most important event in Judaism. It marks the liberation of the Israelites from slavery in Egypt and is central to Jewish identity and faith. This event is commemorated annually during Passover.
The changing times.
Roman oppression in the land of Israel / province of Judea
Dependent event :)
The journey into Cana'an details the beginning of Judaism.
Pentecost is a Christian event that plays no role in Judaism.
According to the laws of Judaism, any child that is born to a Jewish woman is a Jew. There is no event that makes a person Jewish unless they converted to Judaism from a different religion. You may have been thinking of the circumcision ceremony, or the Bar Mitzva.
The exodus from Egypt is the most important event in Judaism, as it marks the liberation of the Israelites from slavery and the beginning of their journey to the Promised Land as described in the Hebrew Bible.
Independent
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You need to state what event you are asking about.