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Agreed, idolatry still exists today. Throughout time, idolatry has been practiced by wayward Jew and Gentile alike.

I should also have added the internet to the list of modern idolotrous practices. The modern gods that i mentioned are practiced by people who are not particularly wayward, just poorly-educated.

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However, there were only seven societies/cultures - existing only in the past...

Since they were not totally eradicated, they still exist today, perhaps with other names. The commandments to eradicate them still is in force.

Halacha is not derived from a simple reading of the text. According to your interpretation of the verses from the book of Deuteronomy, the commandment to destroy the seven nations is a one-time deal; When you enter the land, kill them all. Then this halacha goes into the archives.

If you would check a listing of the 613 commandments, you will see that there are 3 commandments regarding this:

Not to make a covenant with the seven Canaanite nations due to their idolotry (Ex 23:32; Deut 7:2)
Not to allow any individual of the seven Canaanite nations to remain alive.(Deut 20:16)
To totally exterminate the seven Canaanite nations from the land of Israel. (Deut 20:17)

While the commandment is to remove them from Israel, there is no time limit for this. In His infinite wisdom, Hashem knew that it would not happen as He commaded. As a result, to this very day, these commandments are still in full force.

Some of the other examples you cite are not considered to be mitzvos by any authority.

I suggest that you look at a list of the 613 commandments. I am sure that there is a list of them at jewfaq.org and at aish.com