Thanks for sharing this important petition, which I signed.
It petitions Navanethem Pillay, the UN High Commissioner for Human Rights, to "Amend Articles 13 (b), 55 (c) & 76 (c) of the 'Charter of the United Nations and Statute of the International Court of Justice,' to include freedom from religion." The current language in those articles of the Charter says "without distinction as to race, sex, language, or religion."
I signed it. I used to get things like this from Change org. pretty often but I think their budget is larger now.