I agree strongly with the idea that religious belief evolves according to events. It might be true to say that all things change over time.
Some things in real life do not change or change at a rate too slow to observe such as the sequence and structure of geological formations. Gemstones must be an exception to the rule of all things changing. Contrast this with the ever changing nature of ideas and beliefs.
Most certainly Jewish defeats galvanized the desire for a heroic redeemer especially in the book Isaiah, where driven by loss and impotence, the writer imagines the arrival of a glorious all conquering saviour.
The Bible from start to finish is a reflection of
the thinking and beliefs of people at all the evolving stages of their cultures and ideas
over time. Starting with offering the gods blood sacrifice and developing from polytheism through henolatry (worshipping one particular god) finishing in Revelation in a riot of visionary
monotheism jam packed with Greek and not so philosophical mumbo-jumbo.
So we need to be mindful of language too and note that it also evolves, such as seen in the contempt put into the word pagan by the Roman church to distance itself from the true folk origins of Christianity. (Pagan simply meaning "of the village people" in Latin and by inference "the uneducated").
A significant mistake would be to imagine that the career of the Jews has any special meaning to it. The Bible is just their dreams writ large.