BELGRADE, Aug 28 (Reuters) – Thousands of religious and right-wing opponents of a European gay Pride event to be hosted by Belgrade protested through the Serbian capital on Sunday, even though the government has said it would scrap or delay the Pride event. Belgrade is due to host the EuroPride march on Sept. 17, an event staged in a different European city each year. But President Aleksandar Vucic said on Saturday it would be cancelled or postponed, citing reasons such as threats from right-wing activists.