How did Hebrews beliefs developed?

Answer 1

According to our tradition, Abraham (18th century BCE) developed the religion which became known as Judaism. The Kuzari (Rabbi Judah HaLevi, 1075-1141) states that Abraham was a gifted man of high intelligence; and, as Maimonides (1135-1204) describes, Abraham didn't blindly accept the ubiquitous idolatry which had been foisted upon his countrymen. He contemplated the matter relentlessly, finally arriving at the conclusion that there is One God and that this should be taught to others as well. This is what is meant by his "calling out in the name of the Lord" (Genesis ch.12). He continued his contemplations, eventually arriving at the forms of behavior which God later incorporated into the Torah given to Moses. Abraham taught disciples (Talmud, Yoma 28b), gave tithes (Genesis ch.14), strove to raise a family (Genesis ch.15, 17, and 24) which would serve God, made a covenant with God (Genesis ch.15 and 17), welcomed guests into his home (Genesis ch.18) unlike the inhospitable Sodomites (Genesis ch.19), prayed for people (Genesis ch.18), rebuked others when necessary (Genesis ch.20), eulogized and buried the deceased (Genesis ch.23), and fulfilled God's will unquestioningly (Genesis ch.22).

It is therefore clear why God expresses His love for Abraham (Isaiah 41:8) and calls Himself the God of Abraham (Genesis 26:24), and says that Abraham obeyed Him fully (Genesis 26:5).

Answer 2

According to tradition, Abraham founded Judaism, and Moses later received the Torah from God.
Abraham, tenth generation descendant of Noah, of Hebrew lineage, was the son of Terah, uncle of Lot, father of Isaac, grandfather of Jacob, and ancestor of the Israelites. His story is in Genesis ch.11 (end), through ch.25. Jewish tradition states that he was the first to teach belief in One God; and it is in his merit that Jews continue to exist (Genesis 18:19, and ch.17).
Abraham (18th century BCE) came from ancestry that had been God-fearing a couple of centuries earlier but had afterwards slipped into idolatry (Joshua 24:2). Nimrod, the idolatrous tyrant, had brought Abraham's father (Terah) from the Semitic ancestral seat near the conjunction of the Balikh and the Euphrates, and instated him in a position of power in his army in the royal Babylonian city of Ur, where Abraham was born. Nimrod persecuted any who would question his idolatrous cult.
The Kuzari (Rabbi Judah HaLevi, 1075-1141) states that Abraham was gifted with high intelligence; and, as Maimonides (1135-1204) describes, Abraham didn't blindly accept the ubiquitous idolatry. The whole populace had been duped, but the young Abraham contemplated the matter relentlessly, finally arriving at the conclusion that there is One God and that this should be taught to others as well. This is what is meant by his "calling out in the name of the Lord" (Genesis ch.12). As a young man, he remonstrated with passersby in public, demonstrating to them the falsehood of their idols; and our tradition tells how he was threatened and endangered by Nimrod.
Subsequently, Terah relocated to Harran; and it is here that Abraham began to develop a circle of disciples (Rashi commentary, on Genesis 12:5).
Later, God told Abraham in prophecy to move to the Holy Land, which is where Abraham raised his family.
He continued his contemplations, eventually arriving at the attitudes and forms of behavior which God later incorporated into the Torah given to Moses.
Abraham, with God's help, singlehandedly trounced the supremacy of the evil Nimrod. He received God's promise of inheriting the Holy Land (Genesis 13). He strove to raise a family (Genesis ch.15, 17, and 24) which would serve God (Genesis 18:19); and God eventually blessed his efforts, granting him many children (ibid., ch.16, 21 and 25), as He had promised (Genesis ch.17). Abraham founded the Jewish people and lived to see his work live on in the persons of Isaac and Jacob; and he taught many other disciples as well (Talmud, Yoma 28b). He saved the population of the south of Canaan from invading foreign kings (Genesis 14); and he was feared by neighboring kings (ibid., ch.12 and 20). Abraham gave tithes (Genesis ch.14), entered into a covenant with God (Genesis ch.15 and 17), welcomed guests into his home (Genesis ch.18) unlike the inhospitable Sodomites (Genesis ch.19), prayed for people (Genesis ch.18), rebuked others when necessary (Genesis ch.20), eulogized and buried the deceased (Genesis ch.23), and fulfilled God's will unquestioningly (Genesis ch.22). He became renowned as a prince of God (Genesis 23:6).
All of these forms of behavior were based upon the ways of God, which Abraham comprehended through his contemplations. These, and similar personality traits, were the teachings of Abraham and his descendants (unlike idolatry, which had tended to go hand in hand with cruel, licentious and excessive behavior, since the caprices which were narrated concerning the idols were adopted as an excuse to imitate those types of behavior).
It is therefore clear why God expresses His love for Abraham (Isaiah 41:8) and calls Himself the God of Abraham (Genesis 26:24), and says that Abraham obeyed Him fully (Genesis 26:5). And this is why, according to our tradition, Abraham is credited with having begun the religion which became known as Judaism. However, Abraham and his descendants observed their traditions voluntarily, until the Giving of the Torah to Moses 3325 years ago, when God made it obligatory.
Moses was an Israelite, a great-great grandson of Jacob. He was born 245 years after the death of Abraham. The time when Moses was born was when the Pharaoh ordered his people to kill all Jewish male infants because he (Pharaoh) was afraid that the Israelites would become too strong for him (Exodus ch.1-2). Moses' mother didn't want him to die. So she made a basket for him and put him in it to float in the Nile reeds. He was found by the Pharaoh's daughter, who took pity on him (Exodus ch.2) and raised him as her own son. He was forced to flee after killing a cruel Egyptian taskmaster, and went to Midian, where he wedded the daughter of Jethro. He eventually achieved the highest level of prophecy (Deuteronomy ch.34) and was called upon by God (Exodus ch.3). He brought the Israelites out of Egyptian slavery (Exodus ch.12). He received the Torah from God (Exodus 24:12) and later recorded it in writing (Deuteronomy 31:24). He went up on Mount Sinai for 40 days and nights (Deuteronomy ch.9-10) and brought down the Two Stone Tablets with the Ten Commandments (Exodus 31:18). He brought the Israelites into the covenant with God (Exodus ch.19 and ch.24), and he oversaw the building of the Tabernacle (Exodus ch.35-40). He was the humblest of men and the greatest of prophets (Numbers ch.12).

Answer 3

From a purely historical perspective, there were several major stages to the development of Judaism as we know it today:

1. Early Hebrew polytheism developed away from its Canaanite roots, from the true ancestors of the Hebrew race;
2. YHWH ('Yahweh' - God) entered the Hebrew pantheon some time around the beginning of the first millennium BCE and became the national God of both Israel and Judah, although other gods and goddesses continued to be worshipped.
3. After the final destruction of Israel in 722 BCE, Judah developed towards monolatrism - the belief that other gods exist but do not need to be worshipped. It is also possible that, officially, Judaism was monotheistic towards the end of the monarchic period. However, even as late as the Babylonian Exile, the traditional gods were still being worshipped, at least in some quarters. There is widespread archaeological evidence of the worship of a fertility goddess prior to the Exile. During the later monarchy, the Jerusalem temple became the only place where Jews could offer sacrifices to God, having consequences for Jews during the Exile and, later, after the Roman destruction of the Second Temple.
4. Monotheism became entrenched during the Babylonian Exile, probably encouraged by the Persian benefactors of the Jews. This was a period when many new concepts, such as Satan, angels and heaven as a place of reward, entered Judaism.
5. The destruction of the Second Temple in 70 CE brought 'Second-Temple Judaism' to an end and ushered in what is now called rabbinical Judaism. Although there is the perception of continuity, some have said that rabbinical Judaism is as much a break from earlier Judaism as is Christianity.

Answer 4

Hebrew beliefs developed over time.