HaKatan: You are not defining terms and therefore spreading Sinas Chinam. Give us a direct definition for what you term “the Avodah Zarah of Zionism” and we can discuss it. Everyone agrees secular Zionism was bad. The Netziv was fine with Religious Zionism, and that was back in the 19th century. R’ Moshe didn’t think it was Avodah Zarah as he says a flag isn’t Assur.
Oh, and Rav Ovadia Yosef (he’s pretty universally accepted, no?) says that you should say Hallel on Yom Ha’atzma’ut. See Yabia Omer 5:35 and 6:41. Actually, he says some very nice things about the Medinah there. You might not like it.