In part this is true but this polytheist acceptance was more in relation to when they reached Palestine then settled with other people such as the Samaritans It is well known to Christians the Israelites adopted the canaanite and pheonician deities. It says so in the bible different from how you are describing.
But as Biblical scholars all know and as your pastor probably also knows, but won’t tell you, this was later development and that much of the Old Testament indicates throughout her history, Israel thought that the other gods were very real, and YHWH is jealous of them, like a husband is jealous of a very real other man.
Throughout the Biblical text YHWH seeks to demonstrate his superiority of the gods of the nation. YHWH sends plagues to Egypt because “on all of the gods of Egypt I will execute judgments” (Exodus 12:12). One does not judge things that don’t exist.
Parents can be jealous when their children pay more attention to other parents with their continuely saying "how their friends parents are cool and have a swimming pool and Mecedes spending more time at their friends homes".
I don't see anything contradicting with jealous God . Times of war have songs and poetry. The greatest warrior is God. This is glorification after being victorious!
The Scripture writer than adds “I am the Lord” (12:12). This is not I am in charge—although that is the implication—but I am YHWH. I am YHWH is repeated over 150 times in the Old Testament as a way of boosting the particular deity who has triumphed.
However, the best piece of evidence of Israel polytheistic roots is probably found in Deuteronomy 32:
When the Most High apportioned the nations,
when he divided humankind,
he fixed the boundaries of the peoples
according to the number of the gods;
the Lord’s (YHWH) own portion was his people,
Jacob his allotted share (Deut. 32:8-9). (NRSV)
There is a problem here and with some of the newer versions. Both the King James and the Septuagint regarded as being closer to the original text written by Greek Jews of the time. It is clearly seen here that there is only one God and his angels, where as, 'people' are in the King James version and not the other (lesser) gods.
For Christians it is wise to study any verses making no utter sense or having contradictions to check the Septuagint for some of the issues at least. It is confusing but there is no doubt to Christians researching deeply believe that the Pharisees have been at play here at the beginning to discredit Christianity. Example of "biased editing" excluding the Maccabees (Descended from the priesthood) from the Torah.
Septuagint
Deut:32:8
When the Most High divided the nations,
when he separated the sons of Adam,
he set the bounds of the nations
according to the number of the angels of God.
32:9 And his people Jacob became the portion of the Lord,
Israel was the line of his inheritance.
King James
Deut:32:8
8When the most High divided to the nations
their inheritance, when he separated the sons of Adam,
he set the bounds of the people according to
the number of the children of Israel.
9For the LORD'S portion is his people;
Jacob is the lot of his inheritance
This also applies to the rest of your post.
The debunking is flawed!