Seriously speaking, I think it should be more permitted to celebrate a Yom Yerushalaim, where something did happen, some ness, victory to commemorate, than a yom haatzmaut, where nothing of significance occurred. The occasion of a bunch of irreligious declaring something irreligious, marks no significance in a Jewish history, certainly nothing for a Torah-true Jew to celebrate. The gist of their goal, their mission was ???? ??? ?????, let us be as all other nations.. let us fight with our might… etc. According to a Gra, commemorating such would certainly be an issur of chukos hagoyim.