And what will they do about it other than try to destroy Israel, which they've been doing without success for nearly 70 years? Moving the embassy doesn't change that.
Read some history :) Jerusalem is "The Holy City" for both Islam and Jewry. They have been arguing about it for years. By placing the "US embassy to Israel" there Trump comes down squarely on the Jewish side of that argument.
Learn to separate politics from religion. Israel is our ally and Jerusalem is the POLITICAL and administrative capital of Israel, similar to what Washington, DC, is in the US. Israel is a religiously diverse nation with some citizens who are Jewish, some who are Christian, and some who are Muslim. It's not all about Judaism. The Israeli government is not denying any of those RELIGIONS its place in a multi-denominational holy city.
Actually, what Trump did was to follow a law passed by Congress in October of 1995 ordering our embassy be moved to Jerusalem. His three predecessors used a waiver provision to avoid doing so under the guise of "national security".
So...you are against Trump obeying the law, Jakob? ;)