Do Jews believe in angels?
Christianity and Judaism
In Judaism, Heaven is sometimes described as a place where God debates Talmudic law with the angels, and where Jews spend eternity studying the Written and Oral Torah. Jews do not believe in "Hell" as a place of eternal torment. Gehenna is a place or condition of purgatory where Jews spend up to twelve months purifying to get into heaven, depending on how sinful they have been, although some suggest that certain types of sinners can never be purified enough to go to heaven and rather than facing eternal torment, simply cease to exist. Therefore, some violations like suicide would be punished by separation from the community, such as not being buried in a Jewish cemetery (in practice, rabbis often rule suicides to be mentally incompetent and thus not responsible for their actions). Judaism also does not have a notion of hell as a place ruled by Satan since God's dominion is total and Satan is only one of God's angels.
Sons of God
Traditionalists and philosophers of Judaism in the Middle Ages typically practiced rational theology. They rejected any belief in rebel or fallen angels since evil was considered abstract. Rabbinic sources, most notably the Targum, state that the "sons of God" who married the daughters of men were merely human beings of exalted social station. They have also been considered as pagan royalty or members of nobility who, out of lust, married women from the general population. Other variations of this interpretation define these "sons of God" as tyrannical Ancient Near Eastern kings who were honored as divine rulers, engaging in polygamous behavior. No matter the variation in views, the primary concept by Jewish rationalists is that the "sons of God" were of human origin.