First of all, we are talking about Israel, the modern Nation/State that currently exists in the Middle East, not any sort of metaphorical religion-based national concept. Those two things are (and must be kept), distinct from one another. Anyone seeking to blur the line separating those two very different things is deliberately seeking to confuse the issue (for either positive or negative reasons), to meet some sort of political end.

The reason some say that anti-Zionism is anti-Semitic is that as the sole Jewish state (which necessarily treats "Jewish" as a national term in this respect), it has no shortage of enemies. When distinguishing between those who criticize Israel, the question becomes whether the critique is based on legitimate issues of policy, or if it is just based on the fact that Israel is a Jewish state. Arguing for the destruction of Israel is totally fine, and is not even necessarily anti-Semitic, assuming that the critic's arguments somehow do not single Israel out or hold it to a totally different standard than any other states. In that case, perhaps the critic opposes nationalism in all forms and seeks the dismantlement of all nation-states altogether.

However, the vast majority of anti-Zionists adhere to an ideology that singles Israel out from hundreds of other nations (many of which are FAR worse in every category than Israel will ever be), not just for criticism, but for attacks that far outstrips any of Israel's perceived crimes. When the anti-Zionist denies Israel the right to exist on its face, when he denies the right of the Jewish people alone to express national self-determination, while remaining indifferent to every other states' right to do so, this can only be described as anti-Jewish.

What you advocate here seems to be a perversion of anti-Semitism that makes it just about impossible to criticize Israel without being labelled a bigot. This is not merely unfair, it is dangerous. People need to have a way of expressing disapproval of Israeli policies without facing unfounded accusations of bigotry. In fact, one of the most common criticisms of Israel right now is that they respond to any critical comment with false accusations of anti-semitism, seeking to blunt even legitimate discourse through fear of slander. Though non-violent, this kind of tactic is very similar to terrorism that Israel so frequently faces. Worse, it doesn't even work. People can't be muscled into treating Israel with kid gloves. There will always be criticism, and this tactic will eventually invite MORE of it, not less. Worse still, if every critique of Israel is met with such vile slander regardless of its accuracy, eventually people will stop respecting the charge. If everything becomes anti-semitic then nothing is anti-semitic. The term becomes robbed of its power and eventually, its very meaning. On the vile site MondoWeiss I recently saw this Gilab Atzmon quote. (As disgusting as all of his quotes are, this one was distinguished by the amount of people there who believed in it wholeheartedly.)

“An antisemite used to be someone who hates Jews;
nowadays an antisemite is someone Jews hate.”

While I disagree with this quote, to say the least, this post of yours seemingly advocates a policy that will all but ensure its widespread acceptance. Hating Israel does not DEFINITIVELY mean that you hate Jews, (although it often does.) The key is determining WHY this hatred exists before we allow such a hideous term as "anti-semitic" to be used against them. For to use such a powerful label capriciously or, FAR worse, against a totally innocent person, we blunt one of our most damaging weapons and end up hurting ourselves more than anyone else.