Well, to be fair, Israel's actions toward the Palestinians are not justifiable. A few of my childhood friends are Muslim, and they tell me that it is mostly about the conflict they have with the Palestinians (even though a good chunk of them are Christian, but you won't hear that on most conservative news sources). The more you learn about the whole ordeal, the less sympathetic you feel for state of Israel. The media, particularly the American press, tend to show only one side of the whole story, and many Christians in the West believe their propaganda. I encourage you to learn more about it, and you too will feel uneasy about supporting such a corrupt government.
Besides this point, the state of Israel is nothing at all related to the Judean kingdom we read about in the Old Testament. They are far from religious, and among the Jews that are show very little hospitality toward anyone not Jewish. I am of the opinion that they should not be a state, or that they should find ways to make amends with the Palestinians. It will require compromise, but no one is willing to let their egos go to do that. No Christian should only be on one side of the fence.