Yonatan Adler, an Israeli professor of archeology, presents archeological evidence of Torah-observance in ancient Israel. His conclusion is there is copious evidence of observance from the first century AD, but there is no evidence of widespread observance of the laws of the Torah before about 150 BC.
Examples of archeologic evidence of Torah observance include:
Stone cups that are not subject to ritual impurity rules that apply to vessels of pottery or wood
Pools for ritual immersions
Synagogue buildings
Removal of images of humans and animals from coins
Absence of the bones for non-kosher meat
All these things are common in Israel in the first century AD but appear to be absent before the mid-second century BC. While the text of the Hebrew Bible may be far older, there is no evidence that the Jewish laws were actually implemented until much later. The period when Jewish observance first appears corresponds to the beginning of Hasmonean dynasty and times recorded in 1 and 2 Maccabees.
My observation is that the oldest evidence of a synagogue (from the Greek word for “assembly”) comes from inscriptions in Egypt from the 3rd century BC. That is also about the time of the translation of the Hebrew scriptures into Greek.
Did the introduction of synagogues from Greek-speaking communities actually drive the development of Judaism in Israel?