Zionism has nothing to do with Judaism. It is a political movement, nothing more.
Many Christian Zionists are part of a fake Christian cult - The New Apostolic Reformation which promotes the non-Biblical 7 mountains theology. Some such as Christian Zionist John Hagee have publicly said that Jesus is not the Messiah.
Genesis 12:1-3 does not say anything specifically about Jews or Israel. Neither existed at that time.
Genesis 12
2 And I will make of thee a great nation, and I will bless thee, and make thy name great; and thou shalt be a blessing:
3 And I will bless them that bless thee, and curse him that curseth thee: and in thee shall all families of the earth be blessed.
Hebrew for nation is goi or gowy, the basic general Hebrew term for an ethnicity, lineage or nation. The term goi s used more in Genesis and the earlier sections than later.
Micah 4:2
And many nations (Hebrew word GOY) shall come, and say, Come, and let us go up to the mountain of the Lord, and to the house of the God of Jacob; and he will teach us of his ways, and we will walk in his paths: for the law shall go forth of Zion, and the word of the Lord from Jerusalem.
In these cases Goy, Goi etc. is a term used by a Jew to refer to someone who is not Jewish or a term used by an observant Jew to refer to a Jew who is not religious or is ignorant of Judaism. It can also refer to "all" (Jew, non-Jew etc).
And of course, I think everybody knows that the term "seed" in Genesis 12:7 is singular and refers to Jesus Christ, Yeshua.
Galatians 3
14 That the blessing of Abraham might come on the Gentiles through Jesus Christ; that we might receive the promise of the Spirit through faith.
15 Brethren, I speak after the manner of men; Though it be but a man's covenant, yet if it be confirmed, no man disannulleth, or addeth thereto.
16 Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ.
the New Apostolic Reformation:
https://pjmiller.wordpress.com/tag/new-apostolic-reformation/page/1
Also, you can research